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• Hey it's me Destin welcome back to Smarter Every Day. So if you think about it, for thousands of years people have verbally

• skipped along or passed down through generations the art of skipping

• stones, and today it's my turn to do the same. So when you throw it,

• you hold it on the side like this, and then when you throw it you spin it. You remember how

• you didn't think you could skip and then I taught you how? But now you can right?

• Are you a good skipper? - Yes. - Do you think you can do this?

• - Yes. - OK here we go. Ready? Watch. 3..2..1..

• Did that work? - Yeah

• OK. ... What just happened?

• - Skip. - Yep. High five.

• We're gonna have to wait a little bit before you learn buddy. So obviously

• the shape is important. You want something wide and flat.

• So now we've got four variables. The first one is the velocity of the rock. We want to keep

• it as fast as possible so kinetic energy stays in the system. The second one is the angle of

• attack. You want that rock to be twenty degrees with respect to the surface of the water.

• Scientists in France determined that that is the optimum angle at which a rock will keep

• skipping, so keep that at twenty degrees, not twenty-five, not fifteen, as best you can

• to twenty. OK the third one is the angle of impact of the rock

• to the water. You want to keep it as low as possible so it'll skim along the surface because if you get much higher

• than forty-five it's impossible for it to skip. So you want to keep it down so it'll skim.

• And the last variable is the rotational velocity. You want to spin it as fast as you can.

• That way it acts like a gyroscope and it doesn't dip down when it nutates

• and dip into the water because the angle of attack is all wrong. Angle of attack twenty,

• and...

• Alright it's about eight. My personal best is twelve so that's pretty good. You've done that a time or

• two haven't you? - It's the third time today. - [laugh] You're living right.

• Alright, so I asked you guys to send me postcards because I'm

• covering a room in my house that we're adding onto. Basically we closed a patio in.

• And several of you sent postcards and I'm very very excited about it.

• To the point where I've got to show you. So I'm gonna show you who all sent me postcards. T.S.Davis

• from Austin Texas. Saywen Wells. Saywen must be like three or four.

• That's pretty awesome. Alberto from Spain. My first one. Mr Coma sent me

• one, a fossil. Another one from Spain. A fossil? No way!

• Oh that's right, a fossil. - I found it.

• - A fossil, very good. See if you can skip it. I've never skipped a fossil.

• 1.. 2.. Fossils are not good at it.

• Luke sent one from London. He's not in London now. Paris from Canada

• Dory sent me a fractal from California. Roman, his wife and two cats

• sent me this one. He walks there. Diego from Maryland.

• Michael sent me an Einstein. Jake from Port Townsend. This one's from Seattle. I love it.

• It says, Hi Smarter Every Day. I like your videos.

• This is John, he's got a daughter named Sadie. Say hey. - Hey.

• - Go skip rocks. You're supposed to be learning how to skip rocks.

• Max sent me a Giblonski diagram. Giblonski? Giblowski?

• [Splash] Hey! You're getting wet! No, no. Go skip rocks. Don't throw big ones.

• Do you understand? - Yes sir. - OK. This is by far my favorite.

• Sequoia National Park California. However this is from

• 1939. Howdy y'all. Found a stack of these in a box after my dad

• passed away. I've been watching your channel since you gave your dad a chicken for fathers day.

• Thank you. I really appreciate that Andy. I will not

• put a staple through this I promise. Logan from Pensacola.

• Axel from the Netherlands. Mary Elizabeth from New York.

• That's pretty awesome. This is a gator from Ty. Pasan from Atlanta.

• Cliff and Lily sent me a really big post card from Nebraska. Nathan says

• Hay. [laugh] This is Casha from southern California and she says here's to

• your postcard wall. So this is Jonathan. He went to Peru after he saw the macaw video

• Claire from Boston. She's from Chicago originally. She sent two

• and she gets the award for the most beautiful handwriting.

• It's insanity. It's very very good. This is JV.

• He sent me a dinosaur. OK James from Minnesota are you near Lake Wobegon?

• Kal or Kale, I don't know how to say it, excuse me, from Sweden.

• He stop. He made this himself. It's kind of similar to what we're doing

• right now. That's pretty cool. He made it at cardsinthepost.com.

• That's pretty smart. So if you don't have a postcard you make your own. And this is from Beaumont. He's in

• the UK. It's pretty cool. Hey I'm making a video! You're supposed to be skipping

• rocks, there's a test later. This is Jack,

• or Jaques from Paris. That's a pretty one. Very nice.

• He says some very nice things on the back. I'm going to staple them up here.

• But clearly we have nowhere near enough postcards, so

• please send me more. I'll leave the address in the video description. As long as the address is there

• I still need postcards, cause I've got to cover this whole room. - We need some more postcards.

• I do not want to paint up there. - So if you want to see how I'm doing on the postcard project

• check out the second channel Funner Every Day, I'll keep it up to date with info. Thank you very much for

• your support it means a lot. I appreciate it. Have a good one.

Hey it's me Destin welcome back to Smarter Every Day. So if you think about it, for thousands of years people have verbally

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# Skipping Stones and Mailing Postcards- Smarter Every Day 88

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林宜悉 posted on 2020/03/26
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