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You could just freeze a cup of water, and then stick a penny in top of it. If you ever come back to find your penny embedded or at the bottom of the cup, you kn
by oh_sigh 6y ago
You could just freeze a cup of water, and then stick a penny in top of it. If you ever come back to find your penny embedded or at the bottom of the cup, you know your freezer thawed out at some point
- jandrese 6y agoJust make sure to cover the cup so the ice doesn't sublimate away.