Tree Seed Propagation
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It appears to be tree seed season where I lieve, with some of the fluffly seeds in such abundance they look like snowdrifts.  I have been most intrigued by seed helicopters, like those of maples.  I never truly appreciated how well they can travel until I saw them in the wind on the second floor, and they got a good boost from the wind.  I would like to try launching both one of the plastic propellor toys and a paratrooper toy from the roof on a windy day.