I have one of those friends who is constantly sending me links: photos, videos, articles, you name it. Most of the time it just gets deleted - I mean, who has time to look at 20-30 links a day, every day, on top of the Internet time wasting they already had planned? But I digress.
One of the recent links was a web-comic from the site xkcd. The comic was OK, but what I found even more interesting - well, WAY more interesting - was this treatise on solar sails and laser elevators. I love the diagrams (definitely my style of explaining scientific concepts) and the way the whole thing is explained. I hope you enjoy it, too.
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