It sorta amazes me when people think that something they just picked up is like some holy grail of knowledge.
Uh...people have been sailing since recorded history. Some guy ( or chick, who knows) looked at the wind, and a log, and thought 'hey, if the wind is pushing me...when I put this palm frond up, and hold it on the floating log....will it push me and the log?"
I know it feels like rocket science to a lot of people, but the basic thing is that it's about as natural as it gets. Observe a bird, closely. You have it.
Two Americans move to the TCI.
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