Health
It’s easy to look at history and judge the ignorance of past generations. We know that the earth is not flat (well, most of...
Hi, what are you looking for?
It’s easy to look at history and judge the ignorance of past generations. We know that the earth is not flat (well, most of...
Originally published on Green Building Elements. Thanks to John Perlin for providing GBE with this intro to his book on the history of solar energy. We published...
Humans have dreamed of flying from before the time of Leonardo da Vinci. Secrets have been revealed. The first video is awe-inspiring and the...
[Note: You should definitely watch the video below and see the very natural-looking way the wings of this flying machine flap.] Ornithopters (from the Greek...