Why is this task so difficult for machines?

0:00 For 10 years, I've been making eggs for breakfast.

0:03 And for 10 years, I have been annoyed.

0:06 I always get egg on my fingers.

0:08 So, I go wash them off, grab the next egg, and do [music] it again.

0:12 GH, which drives me absolutely crazy.

0:16 I've been fantasizing for years about [music] some kind

0:19 of tool that would cleanly crack an egg for me.

0:22 So, I decided to make my own, thinking, how hard could it be?

0:26 Turns out very very hard is the answer.

0:30 I was thinking this would be a pretty simple [music] mechanism but one

0:32 thing led to another and I basically

0:35 ended up designing a mechanical computer which

0:37 of course was very hard to get working and since every failure basically meant

0:42 exploding an egg [music] in my shop wasn't very fun to test and the smell.

0:49 And after all that my wife wasn't nearly

0:51 as impressed as she [music] should have been.

0:53 It's huge.

0:54 It's complicated.

0:56 It's ugly.

0:58 But they say you can't make an omelette without breaking a few eggs,

1:00 or in my case, a few pallets of eggs.

1:03 So, come watch me go from youthful optimist [music] to mature

1:07 pessimist as I try to solve one of the trickiest kitchen tasks.

1:11 I want this to be a handheld thing that I could actually use in a kitchen.

1:16 So, no electronics, no software, no 500lb milling machine,

1:20 no lasers, handheld, compact, purely mechanical.

1:24 And I think I have an idea for how I could do this.

1:28 Eggshells are brittle.

1:29 If you stretch them beyond a certain point, they just crack.

1:33 Which reminds me of a cool thing about glass.

1:34 [music] If you scratch it and then crack it,

1:37 the crack tends to follow the scratch.

1:41 [music] And I'm wondering if we could do the same thing with an egg.

1:44 put a scratch around it where we want it to break

1:46 and [music] then start a crack and hopefully split the egg in half.

1:50 It's actually kind of hard to make a scratch on an egg

1:52 that goes all the way back around to where it started.

1:55 So, I really hope this doesn't blow up in my lathe.

2:00 That would have been a lot easier if I hadn't

2:01 glued the egg in with an inch of run out.

2:04 But, [music] we have a decent scratch.

2:05 Let's see if we can get it to crack.

2:10 [music] Yeah, it totally split right along the crack.

2:13 And it hasn't [music] just split in half because

2:15 there's still that membrane on the inside holding it together.

2:18 So to actually crack it,

2:19 we're going to have to hold it on both sides [music] and hopefully tear it.

2:25 Oh man, I [music] crunched it.

2:27 But the side that didn't get crushed looks great.

2:29 Nice clean break.

2:31 I think this is really promising.

2:32 And we can make a device that does this.

2:35 Scratch the egg, crack [music] it, dump the contents.

2:38 Let's go make an egg cracker.

2:41 I'm imagining a handheld tool that kind of looks like this.

2:43 It would hold the egg from both sides

2:45 with some kind of gripper that can spin it,

2:47 and then it would have a cutting head with a little knife to scratch the egg,

2:50 and then a hammer to hit that scratch [music] and crack it.

2:53 After that, the grippers would pivot down to tear the membrane and dump the egg.

2:57 And we don't want egg on our fingers,

2:58 so they also [music] have to eject the shell.

3:00 And I want this easy to use.

3:01 So, all of this will happen when you turn a crank.

3:04 And it's the crank that [music] makes this crazy.

3:06 Like, how do you scribe and then hammer and then

3:09 dump and then eject just by turning a crank?

3:13 It's going to be bad.

3:14 But we have to put a pin in that thought

3:16 because there's a riskier problem we have solved first,

3:18 which is holding the eggs.

3:20 We have to hold the sloped end of an egg,

3:22 which is going to want to just pop right out of the gripper.

3:25 And then there's a lot of variation in the shape and size of eggs.

3:28 And whatever I come up with has to be able to hold them all.

3:31 I spent a really long time trying to figure this out.

3:33 I considered everything from spikes to glues to suction cups,

3:38 but I have an idea that just [music] might work.

3:40 So, let's see.

3:41 So, this is a mold that's 3D printed.

3:44 I'm using it to cast silicone around a 3D printed part,

3:47 which is surprisingly easy to do.

3:49 You inject the liquid rubber, wait a few hours, and then you have your part.

3:53 This is called over molding.

3:55 The egg just slides in like this, and it

3:57 [music] basically palms the egg and holds it really well.

4:00 And the stretchy silicone can expand

4:03 to accommodate pretty much [music] any egg size.

4:05 One of the tricky things about making something like

4:07 this is that the silicone doesn't really bond to the plastic.

4:10 So, we had to make a special shape within the hub that the silicone

4:13 will mold around and [music] get physically

4:15 trapped so that they can't come apart.

4:17 And then after the egg has been cracked,

4:19 there's a built-in spring-loaded ejector that can eject the shell.

4:26 That was close.

4:27 And then, oh, having too much fun.

4:33 So, I want to test these to make

4:34 sure they work before we build [music] anything else.

4:36 I'm going to scratch and crack it by hand.

4:39 Then, we're going to see if we can split

4:40 the membrane with these, which I think is the hardest part.

4:42 [music] So, if I put the other gripper on here and twist, it should split.

4:47 It's not [music] even close.

4:50 Man, that membrane is strong.

4:52 I thought this was [music] going to work for sure.

4:55 I tried a bunch of different rubbers from really [music] soft

4:58 and grippy ones to stiffer ones that'll grab the egg tighter.

5:02 [music] Nothing is working.

5:07 So, fundamentally, the problem seems [music]

5:09 to be that they can stretch this way,

5:10 which limits how much torque they can apply to the egg.

5:13 So, we don't want it to stretch this way,

5:16 but we want it stretch in this direction so that we can still get eggs into it.

5:20 And I think it should be pretty easy to do.

5:23 This is the new hub for our egg gripper.

5:25 It has these tethers built into it which are really flexible in this direction,

5:29 but they're really strong in this direction.

5:31 They don't stretch at all.

5:33 And the silicone gripper is cast around these tethers.

5:36 This is a partial pore,

5:37 so we can kind of get a cross-section view of what's going on.

5:39 The little T-shaped ends of these keys into the rubber.

5:42 It makes it really strong in this direction.

5:44 If you try to pull on it, it doesn't stretch at all,

5:47 but their flexibility still lets the rubber stretch outward,

5:50 so we can get an egg in there.

5:51 This holds the egg 100 times better.

5:53 Here's one of the old ones.

5:55 [music] So, I'm just going to manually score and fracture

5:59 the eggshell and see if these grippers can pull it apart.

6:04 Oh gosh.

6:06 [music] Yes, [snorts] I knew it.

6:18 You just have to hold the egg, right?

6:21 We can finally hold the egg.

6:23 Now we have to make everything else.

6:25 And what we're gonna have to do, I think,

6:27 is work backwards from the egg grippers to everything

6:30 else because these are sort of set in stone.

6:33 Which means we need to figure out the main body and crank.

6:37 When you're trying to figure out how to even do something,

6:39 [music] it makes it 10 times harder to only have a tiny bit

6:43 of space to do the thing in that you don't even know how to do.

6:47 Every time I've ever made something handheld, I've said,

6:51 "I'm never doing [music] that again." And then I do it again.

6:54 These are some of the most complicated parts I think I've ever had to design,

6:58 and it's for [music] a stupid egg cracker.

7:01 But I think I have something that might work.

7:04 So, let's get them made and find out.

7:08 3D printing is always my preference because it's so easy to do,

7:11 and thankfully, I've been able to use it for most of the parts.

7:15 There are a few select machine parts, but they're all pretty simple.

7:21 And here it is all together.

7:23 Doesn't really do anything yet, [music] but we're getting there.

7:26 This is the crank that's going to drive everything.

7:28 And it spins the egg through a series of drive shafts and bevel gears.

7:32 And then to split the egg and dump it out,

7:34 the egg grippers [music] can pivot down like this.

7:36 And they're spring-loaded against a hard stop,

7:38 so they always return to the starting [music] position.

7:41 And to make them pivot, you pull on this cord, which is routed around a pulley

7:44 that's integrated into the pivoting [music] part.

7:47 The cord isn't connected to anything yet,

7:49 but the plan is to make a mechanism that will pull on this at the right time.

7:52 And this side pivots on the drive shaft.

7:54 It's kind of a two for one special,

7:56 which I hope doesn't come back to bite me later.

7:59 And there's a critical detail here.

8:00 The drive shaft has to be designed to rotate this [music] way.

8:03 If it rotates this way,

8:05 its torque will also make the egg gripper pivot down, which is no good.

8:09 And then we also have the eggshell ejectors.

8:12 The ejectors are a spring-loaded shaft that goes

8:14 through the drive [music] shaft and is

8:16 held back with a little latch which releases it when you push it up.

8:19 But the latch isn't going to release itself.

8:21 We need something to trigger it when the time [music] is right.

8:24 But it's tricky because they're inside this rotating gear box

8:27 and running another mechanism through this pivot would be a nightmare.

8:30 So I designed the egg dumping [music] to have two positions.

8:33 The first would dump the eggs.

8:35 Then we'll rotate even further [music] which lifts up

8:38 the latch with a little ramp releasing the ejectors.

8:41 And even this was [music] tough to fit in here.

8:43 And then the last detail is this side slides back

8:46 and forth so we can fit all the different sizes of eggs.

8:50 Now that we can spin the egg,

8:52 we need the thing that scratches and cracks the shell.

8:54 I'm imagining a sort of floating head

8:56 with a tiny knife that can cut [music] into it.

8:59 And then next to that, we'll have a spring-loaded metal

9:01 rod which can hammer on the scratch to crack it.

9:04 And here's what it actually looks like.

9:06 This cutting head is tiny.

9:07 It was a challenge to fit all this in here, but we got it done.

9:11 So, let's go do some five-axis machining.

9:15 [music] Parts like this cutting head make

9:19 me so thankful to have a five-axis mill.

9:21 [music] It has holes and features on every side that are offaxis,

9:25 and a lot of stuff isn't even square.

9:27 And the five axis can rotate the part to all

9:29 the different orientations and machine it all in one shot.

9:33 Well, except for that tab on the bottom, but we don't talk about that.

9:37 [music] And so much for everything being 3D printed.

9:41 This used [music] pretty much all of my tools, even some weird ones.

9:48 This tiny little part on the end of all this is the cutting head.

9:52 It is so tiny.

9:54 And ultimately, it's going to mount on the main

9:55 drive shaft floating above the egg like that.

9:58 And this is the cutting blade.

10:01 [music] It goes in like this so that we can

10:02 tune how deep it cuts and try different blades.

10:04 The cutting head will contact the egg right about here.

10:07 Getting the shape of this dialed in so that it

10:09 could cut all the different shapes of eggs was really challenging.

10:13 [music] And then this is the hammer.

10:14 It's a metal rod with a rounded tip that's spring-loaded.

10:18 It's positioned to hit exactly on the scratch made by the cutting blade.

10:21 And this spinning cam lifts and drops it.

10:23 The main drive shaft will go through here.

10:25 And as it turns, it'll spin the cam with this belt.

10:29 Although this means the hammer will always be

10:31 hammering and I'm worried that might cause issues.

10:33 So I'm going to also have a little pivoting latch

10:36 which will catch the hammer in the pulled back position.

10:38 But if you push the latch out of the way,

10:40 then the hammer is free to hammer as much as it wants to hammer.

10:43 This gives us a simple way to turn the hammer on and off

10:45 by pushing and pulling on a rod with some other part of the mechanism.

10:48 So I was just looking at this and I realized I'm an idiot [music] unfortunately.

10:56 So, I designed everything for the hand crank to be turned this way,

11:00 but that'll just jam up the hammer.

11:02 I even had an item in my to-do list

11:04 to check that everything was turning the right direction,

11:07 and [music] I checked it off.

11:12 It's going to take a bit of hacking.

11:14 This ended up being less bad than I was expecting.

11:17 I just stuck another gear in there and it reversed everything.

11:20 I don't think I've ever had a literal UNO reverso card work before.

11:25 Awesome.

11:28 At this point, this thing has all the hardware that it needs to crack an egg.

11:32 But if I turn the handle, [music] it'll just spin the egg forever.

11:36 And that's because there's nothing in here to actually make

11:38 it do all the different functions in the right order.

11:42 [music] So, we basically need to program it, but we don't have a computer in it.

11:47 So, we're going to have to do it mechanically.

11:49 Imagine connecting our main crankshaft to another shaft

11:53 with a very weird set of gears that look like this.

11:55 Every rotation of the crankshaft will make

11:57 this gear move through a set of distinct positions.

12:00 I'm going to call this the program wheel because we should be able

12:02 to use its movement to [music] make this thing do a series of programmed steps.

12:06 For example, when we start cracking an egg,

12:08 we want the scribe to be pressed into it to cut a groove.

12:11 We could make a shape that pushes the cutting head

12:13 into the egg when the program wheel is in the first position.

12:16 Then when it moves to the next position, it would release the pressure.

12:19 And because the egg is also spun by the drive shaft,

12:21 this would scratch the egg all the way around.

12:23 This shape is called a cam.

12:25 And with a bit of cleverness,

12:26 we should be able to use cams to control everything.

12:29 Remember that little latch to turn the hammer on and off?

12:31 We can make a cam push on that to turn

12:33 the hammer on after we're done scratching the egg.

12:36 Then after that, we can make a cam that lifts the cutting head out

12:38 of the way so it doesn't get dirty when we dump out the egg.

12:41 And then the trickiest part is making it pivot the egg grippers down.

12:45 Both sides have a cord that if you pull on it, twists [music] them down.

12:49 So we can attach those cords to a pivoting arm that looks like this.

12:52 Engineers call this kind of thing a bell crank.

12:55 But in this case, we can put a little wheel on the side of the bell crank,

12:58 which can roll against a cam, which if we shape it right,

13:01 we'll put the egg grippers down part way for one rotation of the crank,

13:04 which will dump the egg out.

13:06 And then the next rotation will rotate

13:08 them further which will trigger the eggshell ejectors.

13:11 Then one more rotation and everything sets back.

13:14 And putting it all together and running it does this.

13:17 It presses the scribe into the egg to cut a groove and then releases

13:20 that pressure and turns on the hammer to hit the scratch and break it.

13:24 Then it lifts the cutting head so it

13:25 doesn't get dirty [music] and dumps out the egg

13:27 and then pivots the egg grippers more to trigger

13:30 the ejectors and then resets for the next egg.

13:33 pretty crazy how much mechanical engineering it

13:35 takes to replicate like four lines of code.

13:39 It's simultaneously really complicated but also really simple.

13:43 You just turn the crank and it cracks your egg.

13:45 So, it's beautiful.

13:47 I love it.

13:48 Although, it would have been a lot easier

13:49 just to write [music] four lines of code.

13:51 But, aren't you glad that I didn't?

13:52 I mean, just look at this thing.

13:54 It's so ridiculous.

13:55 I love that [music] this can exist.

13:57 But at the same time,

13:59 all the incentives are not to make stuff like [music] this.

14:02 The pressure is to make things that are simpler,

14:05 more mainstream, more tuned for the algorithm.

14:07 And I [music] feel this pressure and I'm afraid of it

14:10 because I don't want it to change what I make.

14:12 [music] Like imagine if instead of doing things I think are cool,

14:16 I was trying to do things that would perform well.

14:20 All right, what's up team?

14:21 I made a money cannon.

14:22 Let's go out and pretend to help people.

14:24 But the pressure is real.

14:26 And sometimes I wonder if the pain that I go through is [music] worth it.

14:30 Like the puzzle solving robot, it almost killed me.

14:34 But one day out of the blue, I got an email [music] informing me that I'd won

14:37 an imi award because they really liked my puzzle robot video,

14:40 which was [music] unexpected and amazing and of course

14:44 completely transformed my [music] view of the puzzle robot.

14:47 It's probably my favorite project now.

14:49 So imi stands for [music] independent media initiative.

14:51 They're working with foundations to get nonprofit money

14:55 and then [music] they do the leg work

14:56 to find people that are creating things that they

14:58 think are authentic [music] and artistic and wonderful.

15:02 Then they give them that money.

15:04 They're basically [music] creating a new set of incentives that aren't

15:06 dictated by algorithms and popularity and all that kind of stuff.

15:11 So, thank you imi.

15:12 I am very inspired to make more completely ridiculous things like this.

15:18 And I guess we should see if it works.

15:23 All right, here we go.

15:28 [music] Come on.

15:31 When you put everything together, it never works.

15:34 [music] Or as I like to call it, integration hell.

15:37 The program wheels jamming up under load.

15:40 But after microoptimizing the design, I got it working.

15:43 And then in the spirit of getting

15:44 everything that [music] could possibly be wrong,

15:47 the hammer turned out to actually be a hole punch.

15:50 But that can be fixed with a different shape and different springs.

15:53 Then we had a scriber that didn't make a mark.

15:55 The blade was too dull.

15:56 Then we had a scriber that ripped chunks out of the egg.

15:59 The blade was too sharp.

16:00 Then we had a blade that was in between [music] and it was just right.

16:04 Sorry, the kids are doing a number on me.

16:07 [cough and clears throat] There was a lot of other

16:09 little problems and a lot of me making this face,

16:13 but eventually we got it running smoothly.

16:15 Well, kind of.

16:17 Remember how we made the egg grippers a lot stronger?

16:19 They're so impressively strong that the egg ejectors don't [music] work.

16:22 I don't understand because I tested them when I redesigned them,

16:27 but they don't work now.

16:29 The reason I didn't just put a giant

16:31 spring in here is that I'm extremely space constrained.

16:34 So, we're going to try a different approach.

16:36 Because the egg grippers are airtight,

16:38 if you put air in behind the egg, it pops out.

16:41 I like this because it's a surprisingly easy mod.

16:44 And with air power, there's basically no limit to the egg ejection force.

16:48 The trickiest [music] part is getting air to the spinning egg holders.

16:51 But since they have hollow shafts, we can just make a spinning seal on the end.

16:54 And next thing you know, you got loose eggs.

16:58 I don't know what I did to my boy.

16:59 This is a complete hack job, but it's going to let us test the concept.

17:03 [music] We've got air lines going to both the egg grippers.

17:05 And pushing this syringe in will pump air behind the eggs, releasing them.

17:09 But I realized this can do something else that's really useful.

17:11 [music] If you pull the syringe back, it vacuums the egg into the gripper.

17:16 I'm not sure if we absolutely need this, but more grip is better,

17:19 especially with weird shaped eggs.

17:21 [music] So, let's see if this abomination works.

17:24 All right, so here's how I put the egg in.

17:26 Push it in the one side, bring in the other side, close it, squeeze.

17:30 And if we try to pull a vacuum, it'll just pull the syringe back in.

17:34 So, for now, I'm just holding it back with this bolt.

17:36 Very userfriendly.

17:38 [music] This egg is fully cracked,

17:43 but the program is going to keep hammering it for [music] two more rotations,

17:47 which is busting up the shell and ripping chunks out.

17:49 So, I'm just going to lift up the cutting head

17:51 for now [music] and see how it cracks the egg.

17:54 Oh, yes.

17:56 It's amazing.

17:58 Although the egg spinning is bad.

18:00 That's going to break off shell pieces.

18:03 All right.

18:03 Now, let's see if we can eject [music] the shells.

18:05 3 2 1.

18:10 This one come out.

18:11 All right.

18:12 Just [music] about.

18:13 Very close.

18:14 This thing can definitely work.

18:16 The syringe basically did what it needs to do.

18:19 I think with a bit of tuning that'll be good.

18:21 But I just don't like everything being driven from the crank.

18:24 So, the egg we just cracked was scored

18:26 and ready to crack in like one or two rotations,

18:29 but the program is just going to keep running.

18:31 So, it just kept hammering and scribbing it even though it didn't need it.

18:34 I think we need to be able to control all the different steps independently.

18:38 I think I see a way to do this without changing everything,

18:41 but unfortunately, it requires us to change almost everything.

18:46 So, I think I know what I'm going to be doing for the next week.

18:52 I tried to keep as much of this the same as I could,

18:54 but I ended up changing like 90% of the parts.

18:57 But on the plus side, it was mostly water jetted or 3D [music] printed parts,

19:00 which are a lot easier to remake.

19:03 A big part of my effort was making

19:04 the air system easier to [music] use and not crappy,

19:09 which meant routing all the airlines internally,

19:12 which was a [music] huge pain and changed almost every part.

19:17 It is finally together.

19:20 It's almost like a real thing.

19:21 [music] Everything is properly designed on some level.

19:26 Maybe it was worth it.

19:27 I don't know.

19:27 Probably not.

19:29 Let me show you how it works.

19:30 You put the egg in just like before.

19:32 [music] Then pull this back to vacuum the egg in place.

19:35 And if you want to eject the egg, you press this button.

19:37 [music] But let's not get ahead of ourselves.

19:39 The next thing we do is turn this knob a few times to score and crack the egg.

19:43 And then instead of the program [music] wheel, we have this little lever.

19:46 And this operates all the cams.

19:48 lifting up the cutting head and pivots

19:50 the egg grippers which should [music] not do that.

19:58 What?

20:00 I thought we were done with this.

20:02 Let's just say there are problems with the vacuum system, the egg grippers.

20:08 Oh.

20:08 Oh my goodness.

20:10 And the shell ejection [music] system.

20:12 Now, it'll probably eject this side first.

20:16 And it should eject this side now.

20:23 But there is one problem that's [music] kind of a big deal.

20:26 Do you see it?

20:27 Only half of the egg is coming out.

20:29 [music] This happens when one of the shells comes off first,

20:32 which releases all the air pressure.

20:34 And no air pressure, no eject.

20:36 I saw this on the previous [music] version,

20:38 but I thought I'd be able to tune it out.

20:41 Nope.

20:42 A proper fix is too much work.

20:43 So, I just added this valve.

20:45 Now, if one side fails to eject, [music] you can close off the open side and run

20:49 the ejector again to get out the other shell.

20:52 I actually spent a whole day trying to make pistons [music] that would push

20:55 the shells out with little check valves

20:57 in them so they could still pull a vacuum.

20:59 I just couldn't make them reliable.

21:01 So, this is what we have for now.

21:03 But, I'm okay with that because this is a prototype.

21:05 I know if I did another iteration of it, I could fix all these things,

21:08 but right now I just want to see the process

21:11 work [music] and prove that the concept is sound.

21:14 And it's looking pretty good.

21:15 So, let's see if [music] this thing will work.

21:34 Beautiful.

21:41 Oh man.

21:43 And look [music] how clean this brake is.

21:44 It's like almost perfect.

21:46 All right.

21:47 Now it just has to eject the eggshells.

21:49 All right.

21:49 Here we go.

21:50 3 [music] 2 1.

21:57 Oh, that's so good.

21:59 I know it's just cracking an [music] egg, but it took so long to get here.

22:03 is so cool to see it finally doing it.

22:06 And it [music] is a bit more complicated than I was expecting, but I don't know.

22:10 I just love it.

22:14 With another [music] iteration of redesign

22:16 and remaking probably every single part, [music] we could get rid of the valve.

22:21 I think we could get rid of pulling back

22:22 the syringe and always eject [music] both shells reliably.

22:26 But kind of tired of redesigning and remaking stuff,

22:28 so we're not going to do that right now.

22:31 [music] What I'm curious about is what my wife thinks.

22:33 I suspect she's going to find it a little bit hard to use,

22:36 but only one way to find out.

22:40 All right, wife is here.

22:43 She's ready to judge things.

22:44 She looks like she's got her judging face on.

22:46 Does this look like the future?

22:48 It looks like the stuff [music] of future infomercials.

22:52 Okay, let's not get ahead of ourselves.

22:54 Here's your egg.

22:54 [music] Put the egg in there.

22:57 All right, pull that back.

22:59 The egg is now suctioned in place.

23:02 And give this a few cranks.

23:07 See the little crack?

23:14 Oh.

23:14 Now, [music] how do we get the shells out?

23:16 Press this button.

23:19 All right.

23:19 There goes one.

23:20 [music] Do I do it again?

23:21 Uh, no.

23:22 Pull this back out.

23:24 Now, turn this 90°.

23:26 All right.

23:27 Press it again.

23:29 [music] The future of egg cracking is here.

23:36 Looking past the obvious things that need to be fixed, how many out of 10?

23:41 I don't see an egg cracker.

23:47 How many out of 10 would you give this?

23:51 [music] Three.

23:55 Three.

23:55 That's just evil.

23:57 Do I even need to explain [music] it?

23:58 Yes, explain.

24:00 It's huge.

24:01 It's complicated.

24:02 It's ugly.

24:04 I think it's great.

24:05 It's beautiful.

24:06 [music] You would so cool.

24:13 And maybe if all I had to do was turn the crank, I would try using it.

24:19 [music]

24:19 You take that three and stick it right up your sleeve and get out of here.

24:25 I ain't got no sleeves.

24:26 Jokes's on you.

24:28 I don't know why I even brought this lady in here.

24:31 Three out of 10.

24:33 I don't know.

24:33 I don't agree.

24:35 I'd give it at least a five.

24:39 So, there's this kind of funny story.

24:40 When me and my wife first got married,

24:42 we went and got our first Christmas tree and we had no ornaments.

24:45 We had no lights.

24:46 And I was trying to figure out how many

24:48 strands of lights do I need to [music] buy?

24:49 I want to get the minimum amount cuz we don't have very much money.

24:52 So, of course, I whipped out my TI89.

24:54 [music] And with a bit of calculus,

24:56 I got the length and spacing that I needed and they fit perfectly,

25:01 which was just [music] incredible.

25:03 And I just love this as a tiny little example

25:06 of how useful [music] knowledge can be even for silly problems.

25:10 But if you're trying to learn this stuff,

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26:39 Thank you, Brilliant, for sponsoring this video,

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26:45 And that's a wrap.

26:48 [music] [music]