Template:Are You Sure/April 17

In geometry, a superegg is a solid of revolution obtained by rotating an elongated superellipse with exponent greater than 2 around its longest axis. It is a special case of superellipsoid. Unlike an elongated ellipsoid, an elongated superegg can stand upright on a flat surface, or on top of another superegg. This is due to its curvature being zero at the tips. The shape was popularized by Danish poet and scientist Piet Hein (1905–1996).

• ... that scientist, inventor, and poet Piet Hein (who often wrote under the Old Norse pseudonym "Kumbel", meaning "tombstone") is known for short poems, known as gruks or grooks, such as Consolation Grook, which reads:
"Losing one glove is certainly painful, but nothing compared to the pain of losing one, throwing away the other, and finding the first one again."?

• ... that physicist Johan Carl Wilcke invented an electrostatic generator (1752), an early version of the electrophorus, a device later named and popularized by Alessandro Volta?

• ... that electrical engineer and physicist John Ambrose Fleming invented the Fleming valve (the first thermionic valve or vacuum tube); designed the radio transmitter with which the first transatlantic radio transmission was made; and established the right-hand rule used in physics?