... and why!

less than 1m read

·Nov 10, 2024

The reason this trick works every single time is elegantly simple. It has everything to do with the fact that their chosen card will always be in a pack that is third from the top.

That's because we had them take the pack containing their card, see? There's Boron, and put it on one of the piles. Then we had them put two more piles on top of that one.

So this stack is in order: pack number one, pack number two, pack number three, which contains their card, and at the bottom, pack number four. When they deal the cards out into rows, they are changing the packs into layers.

See, here we go! We've got 1, 2, 3, four cards. These are the cards that made up pack number one. Here comes pack number two; it is now becoming the second layer.

The third layer will be the components of pack number three, including Boron, their card. So when they finish and take the pack containing their card, because it is part of the third layer, it will be the third from the top, which means it will always be the third card from the left. Boron. [Music]

The Best Investing Advice of 2022

Professor Brian Harvey on why not to cheat

View All

When Should You Trust Your Gut?

If you wanted to build a new compiler, if you wanted to build something that’s like really arcane, yeah, but that you know a lot about and you have a lot of taste, again a lot of opinions about, a lot of expertise on, yes, often you should listen to that …

Zero Interest Rate Policy: Handled incorrectly, too much money can be poison.

It turns out that if money was the only variable to making your company work, then startups wouldn’t work, because all the incumbents have way more money. It’s true, Apple has a lot of money—like all the money, all the money effectively, right? Two, um, …

There Is Something Hiding Inside Earth

We’ve found a new planet, home to octillions of the most extreme beings living in the most absurd and deadly hellscape. In absolute darkness, crushed by the weight of mountains, starved of oxygen, cooked alive, bathed in acid, salt or radiation. And yet, …

Life's Biggest Lessons

There’s nothing worse than a sleepless night. We’ve all been there, tossing and turning. You focus all your mental power on trying to fall asleep. With all your will, you force yourself to shut your eyes, turn your brain off, and pray to be whisked away i…

2015 AP Chemistry free response 5a: Finding order of reaction | Chemistry | Khan Academy

[Voiceover] Blue food coloring can be oxidized by household bleach, which contains hypochlorite ion, or OCI-, to form colorless products, as represented by the equation above. So we have this equation where we have blue food coloring, which has this chemi…

Worked example: analyzing an ocean food web | Middle school biology | Khan Academy

So this diagram right over here describes a food web, and a food web models how energy and matter move in an ecosystem. We’re going to use this food web to answer some questions to make sure we understand food webs. So the first thing I’m going to ask yo…

... and why!

More Articles