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Challenge Question: Why can't you use a regular cup in microgravity?
Challenge Answer: Using a regular glass, water particles are attracted to the bottom, and sides of the cup. A small disturbance, such as taking a sip, would cause the liquid to separate from the glass. If the surface tension did not hold the water together, water would float around everywhere. With the "Space-Cup", the liquid will stay attached to the edges, and capillary action will keep the water connected when taking a drink.
Kyle Polansky of Southlake, TX