Pro tip for getting a flat surface quickly. Donald Trump authorizes U.S. military to take control of land on southern border What Salary You Need To Be Middle Class in Every US State New video of ...

how flat does a surface have to be to be considered flat? And from that stems a fascinating story of the evolution of precision machining. A bodger’s pole lathe in action. Simon Speed ...

Consider the astronomical and perceptual changes of a flat lunar surface.

What is it that is actually causing the gravity to make things fall off the end? A flat surface is fairly unstable, the other forces it would be flexible and move around. More from Tech Stuart ...