Everything starts shaking and the coin starts to dances around and vibrate and it looks like it’s trying to escape the block of dry ice in a fit of fury. The ol’ science experiment is always fun to see because everything reacts so quickly. What’s actually happening is that the coin warms up the dry ice turning it back from solid carbon dioxide to gas which furiously moves the coin around.
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Ok, now put it in a bottle with water and close it. Hide behind lead shield.