Template:Are You Sure/June 30
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The Tunguska Event Preservation Society launches fundraiser to simulate the 1927 Tunguska expedition.
... that the Tunguska event was a massive explosion that occurred near the Podkamennaya Tunguska River in Yeniseysk Governorate (now Krasnoyarsk Krai), Russia, on the morning of June 30, 1908; that the explosion flattened an estimated 80 million trees over an area of 2,150 km2 (830 sq mi) of forest; that eyewitness reports suggest that at least three people may have died in the event; and that the explosion is generally attributed to the air burst of a stony meteoroid about 100 metres (330 feet) in size?
... that Albert Einstein's article "On the Electrodynamics of Moving Bodies" (published in Annalen der Physik) introduced special relativity?
... that mathematician William Oughtred invented the slide rule in 1622?