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  • Hey, Vsauce. Michael here. And today I released a brand new

  • Vsauce Leanback. A playlist of educational videos from all over YouTube

  • that I think are cool

  • and I host sort of like a Vsauce TV show. You can start that by clicking the box up in

  • the corner

  • or the link at the top of this video's description. But before that,

  • I wanna talk about the Shepard tone. It's a sound

  • made out of multiple sine waves that play a trick on us.

  • See, what they do is continuously rise in pitch

  • and then every so often one of them drops down an octave,

  • but our brains don't perceive that because the other two

  • continue rising and cover for it. The sine waves take turns dropping down an

  • octave,

  • producing a sonic barber pole, a noise

  • that appears to keep rising in pitch for ever and ever

  • without ever actually going anywhere.

  • I was reminded of it this week by FallingFalling.com,

  • a creation of Internet artist New Rafael, where the Shepard tone

  • seems to go down and fall forever.

  • Rafael also made some other cool sites, like OutInTheWind.com.

  • Here, there's nothing except for dismissing

  • wind that slowly erodes your cursor. Okay, now some of you may already know this, but in

  • America

  • we say "ADIdas," whereas the rest of the world says

  • "adiDAS." And no, it does not stand for "all day I dream about soccer."

  • That's just a backronym, an acronym made up for a word that already exists.

  • Instead, it's named after a person, which is why people pronounce "adiDAS."

  • It's named after Adi Dassler, a German guy who got in a fight with his brother,

  • so his brother rude off, went across the river and started his own athletic company,

  • known as PUMA. That's right. Adidas

  • and Puma came from the same town, from the same

  • family. Finally, before the Leanback, I wanna share this USB typewriter with you.

  • It's a really cool device

  • that plugs into your computer and works like a normal keyboard, except at the

  • same time

  • it keeps a hard copy for your records. It even works with an iPad.

  • Alright, now it's time to watch the Vsauce Leanback. You can click here

  • to start it.

  • I'll meet you over there.

  • And as always,

  • thanks for watching.

Hey, Vsauce. Michael here. And today I released a brand new

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