Simultaneous inventions, Bell and Grey.

When an idea's time has come around, it REALLY has come around. To save space I'll just give a partial list of simultaneous inventions and discoveries without including the names, just the dates. The names can probably be Googled.

Telescope (1608), Sunspots (1611), logarithms (1620), calculus (1675), problem of three bodies (1747), nitrogen (1773), oxygen (1774), water as H2O (1783), steamboat (1788), theory of planetary disturbances (1808), pepsin (1835), telegraph (1837), star parallax first measured (1838), photography (1839), planet Neptune (1845), surgical anesthesia by ether (1846), by nitrous oxide (1845), sunspot variations related to disturbances on earth (1852), natural selection (1858), periodic chart of elements (1869), telephone (1876), phonograph (1877), liquefaction of oxygen (1877), rediscovery of Mendel's laws of inheritance (1900), North Pole (1909), South Pole (1912), jet engines (ca. 1937), flight orientation of bats due to uttered sounds (1943).