His work led to the release of large quantities of lead into the atmosphere as a result of the large-scale combustion of leaded gasoline all over the world. He also discovered that dichlorodifluoromethane, also known as Freon, could be used as a nontoxic and nonflammable refrigerant.

He also developed a method to extract large quantities of bromine from seawater when he learned that bromine was needed to prevent tetraethyl lead from corroding engine valves and spark plugs. Thomas Midgley Jr was instrumental in the discovery and introduction of the gasoline additive tetraethyl lead. *Frederick Pohl, Chasing Science, pg 54ġ944 One of the greatest chemists of the century, and one who inadvertently killed more people than any dictator, died on this day of one of his own inventions. The campus on Mount Wilson is also the place where Michelson made his measurements of the speed of light. It is the location where Edwin Hubble made the observation that some of the fuzzy blobs in space were actually galaxies like our own.

*Wik The 100 inch telescope on Mount Wilson was the largest telescope in the world until the 200 inch in 1948 at Palomar Observatory. According to his account of the night, the first object viewed in the telescope was Jupiter and Noyes himself was the first to see one of the planet's moons through the telescope. Noyes used this night as the setting in the opening of Watchers of the Sky, the first volume in his trilogy The Torchbearers, an epic poem about the history of science. *Philosophical Transactionsġ917 The poet Alfred Noyes was present for the 'first light' of the Hooker telescope on November 2, 1917. Read before the Royal Society Nov 2, 1749. Caspar Wetstein, Chaplain to His Royal Highness the Prince of Wales, concerning the Gradual Approach of the Earth to the Sun. ġ749 Leonhard Euler wrote (June 28) to the Rev. Can you calculate without listing them all? )ģ06 = 92 + 92 + 122 (not impressed?) you can write the same numerals with exponents and 306 =9 2 + 9 2 + 12 2 Really? Still not impressed, how about 306 =82 + 112 + 112 = 8 2 + 11 2 + 11 2. (students, how many triangular numbers have 3 digits. There are 306 triangular numbers with five digits. The 306th day of the year 306 is the sum of four consecutive primes starting with 71. Is one of the oldest branches, perhaps the very oldest branch, of human knowledge and yet some of its most abstruse secrets lie close to its tritest truths.~Henry Bell

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