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1932 – John Cockcroft and Ernest Walton verify Einstein's mass-energy equation by an experiment artificially transmuting lithium into helium. [100] [101] 1934 – Dmitry Blokhintsev and F. M. Gal'perin coin the term 'graviton'. [102] Paul Dirac reintroduces it in 1959. [103] [104]
The American Revolution inflicted major impacts on the 18th-century natural world. At Valley Forge in Pennsylvania, for instance, during the winter of 1777-1778, George Washington's Continental Army soldiers cut down more than 127,000 trees in building their crude log huts, causing both short-term and long-term deforestation.