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Science on the 15th of April in history

Science

Date	Type	Text
15 Apr 1548 Pietro Cataldi	science	birth Pietro Cataldi Pietro Cataldi, Italian mathematician (died 1626)	0
15 Apr 1704 Johann van Waveren Hudde	science	death Johann van Waveren Hudde Johann van Waveren Hudde, Dutch mathematician (born 1628)	0
15 Apr 1707 Leonhard Euler	science	birth Leonhard Euler Leonhard Euler, Swiss mathematician (died 1783)	0
15 Apr 1730 Moses Harris	science	birth Moses Harris Moses Harris, English entomologist and engraver (died c. 1788)	0
15 Apr 1754 Jacopo Riccati	science	death Jacopo Riccati Jacopo Riccati, Italian mathematician (born 1676)	0
15 Apr 1765 Mikhail Lomonosov	science	death Mikhail Lomonosov Mikhail Lomonosov, Russian scientist (born 1711)	0
15 Apr 1772 Étienne Geoffroy Saint-Hilaire	science	birth Étienne Geoffroy Saint-Hilaire Étienne Geoffroy Saint-Hilaire, French naturalist (died 1844)	0
15 Apr 1793 Friedrich Georg Wilhelm Struve	science	birth Friedrich Georg Wilhelm Struve Friedrich Georg Wilhelm Struve, Baltic astronomer (died 1864)	0
15 Apr 1800 James Clark Ross	science	birth James Clark Ross James Clark Ross, English explorer of the Polar regions (died 1862)	0
15 Apr 1809 Hermann Günther Grassmann	science	birth Hermann Günther Grassmann Hermann Günther Grassmann (died 1877), mathematician.	0
15 Apr 1820 John Bell	science	death John Bell John Bell (born 1763), surgeon.	0
15 Apr 1840 King's College Hospital	science	King's College Hospital (medicine) King's College Hospital opens in London.	0
15 Apr 1854 Arthur Aikin	science	death Arthur Aikin Arthur Aikin (born 1773), chemist and mineralogist	0
15 Apr 1907 Nikolaas Tinbergen	science	birth Nikolaas Tinbergen Nikolaas Tinbergen (died 1988), Dutch ethologist, ornithologist and Nobel Prize in Physiology or Medicine laureate.	0
15 Apr 1960 pacemaker	science	pacemaker (medicine) William C. Chardack implants the first fixed-rate cardiac pacemaker with mercury battery, designed by Wilson Greatbatch.	0
15 Apr 1961 Charles Hard Townes	science	Charles Hard Townes (astronomy and space ) R. N. Schwartz and Charles Hard Townes publish "Interstellar and Interplanetary Communication by Optical Masers" in Nature, providing a basis for Optical SETI.	0

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