“Jefferson’s letter to [Isaac] McPherson showed that he weighed the marginal contribution of an invention against basic, foundational technologies, keeping in mind that a mere change of form—like ...

An underwater ship -- A siphon for raising water -- Lifting weights by water, and a portable siphon -- Construction of sluices to raise ships to any height -- A machine worked by fire which can throw ...

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Scientific American is the authority on science and technology for a general audience, with coverage that explains how research changes our understanding of the world and shapes our lives. First ...

The US Navy and Army this week talked up new laboratories they are opening that promise to develop all manner of cutting edge technologies for the future. In the Navy’s case, the service today cut the ...