Thanks, that explains everything.The pythagorean theorem, i would guess after a quick glance

I don’t think so.It's because he's not putting the card through the hole. He's holding the card behind the piece of paper. It's called sleight of hand.
I don’t think so.
I don’t think so. While he likes magic, he’s a scientist at McGill University. His reputation is very much that of a straight shooter in these here parts. It would be very uncharacteristic of him to try to pass off a simple trick as something else. I could be wrong, but I don’t think so.You are definitely gullible. Don't play 3-card monte with any street peeps in Vegas, you won't fare well.
The guy even says in the vid it was showed to him by a magician.
It's because he's not putting the card through the hole. He's holding the card behind the piece of paper. It's called sleight of hand.
I don’t think so. While he likes magic, he’s a scientist at McGill University. His reputation is very much that of a straight shooter in these here parts. It would be very uncharacteristic of him to try to pass off a simple trick as something else. I could be wrong, but I don’t think so.
It is a trick but not sleight of hand. The "square" in the middle is not square but instead a rhombus where the horizontal diagonal in video is large enough for the card to fit through, but the vertical diagonal isn't.
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It looks like a square, but it's more like
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It's easier to see when the card is closer to the paper.
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