Good summer fun for 5-10 year olds (and those who can still channel their inner eight year old)
Supplies: two liter bottles, water, a big sink or tub, 2-4 kids (and “kids”), optional: stopwatches, scissors or box cutter, bottles of different shapes, sizes, opening sizes, etc., a prize for the fastest racer
Procedure: Fill the bottles. On the count of three, empty the bottles. Whoever's bottle completely empties out first wins.
Tips: Run multiple trials, and encourage borrowing and modifying ideas, then have a final race, or elimination tournament with other kids judging. Follow up with an awards ceremony, highlighting different positive behaviors: experimentation, sharing, Expect water to get away: be ready with a mop and bucket. Have extra bottles on hand. One strategy to explore is to cut into the bottles, either punching air holes or widening the opening. Be sure to model proper safety when cutting, particularly during a race when participants might want to manipulate a scissors or knife faster than reasonably safe.
Bonus thought experiment: Take a bottle of water. Freeze it solid. Remove the cap. Will it melt faster facing mouth up or upside down and draining into a sink?
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