Ever since ancient Mesopotamia, mankind has been cruising the seas using one of mother nature's richest source of energy on earth: wind. It's been a few years since these pioneers of energy free loading came up with the revolutionary idea of sailing, but we still use it, and now in ways the Mesopotamian never even imagine.
Great job, guys!
Come on, follow the great news here, and if you want to learn more about light sail, get to it!