[sjducb]

How do I bias a coin flip?

Based on the paper it looks like 55% chance that it will land on the same side it started is possible. This was the most extreme subject.

The bias is caused by procession so I want my flip to process as much as possible. Maybe I offset my finger as far away from the center of the coin as possible. Also putting as much force into it as possible is probably a good idea.

Finally I have to catch it in a way that the top side is facing up when I reveal it.

Any thoughts?

[curriculum]

Give it some spin with your index finger. Imagine putting a coin between your index finger and thumb, heads side up, resting on your middle finger below — not too different than how most people start a coin flip. With your index finger, rotate the coin in its plane, so that it stays “heads up” but the head is rotating. Now try doing this and simultaneously flipping the coin by flicking it with your thumb at a point on the bottom, close to the edge. If you do it right, you’ll impart a spin. If you impart a modest spin, the coin will never actually flip over, but will just wobble, and will therefore land heads up. An observer will likely not know what you did, because it is hard for the eye to tell the difference between a flip and a wobble at high speeds.

[hddqsb]

@robocat linked a great video showing how to do this: https://m.youtube.com/watch?v=A-L7KOjyDrE

[rootusrootus]

> procession [...] process

Nitpick: Precession. This is one case where a minor mispelling really does throw off the meaning of the sentence. At least to me.