Equipment: Two 12" rulers, a small (~2L) dewar of liquid nitrogen, safety goggles and safety gloves. What it does: One ruler is cooled to liquid nitrogen temperature and one is left at room ...
Amidst this mess lies a hidden object - a ruler! Your mission is to spot the ruler in 12 seconds or less. You Have 20/20 Vision If You Can Spot The Pencil In This Playground Scene In 12 Seconds!
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