Josiah Wood Whymper, a British wood engraver, was born Apr. 24, 1813.

Augustus Addison Gould, an American zoologist, malacologist (expert on mollusks) and conchologist (expert on shells), was born Apr. 23, 1805, in ...

On Apr. 21, 1820, according to tradition, the Danish experimental physicist Hans Christian Oersted (Ørsted to the Danes) made a famous accidental ...

Jean François d'Aubuisson de Voisins, a French geologist and mining engineer, was born Apr. 19, 1769, the same annus mirabilis that produced ...

Justus von Liebig, a German chemist, died Apr. 18, 1873, at the age of 69.  Liebig was a pioneer in organic chemistry, agricultural chemistry, and ...

Jean-Baptiste Perrin, a French physical chemist, died Apr. 17, 1942, at the age of 71.  Perrin's youthful proficiency in math earned him entrance ...

Frederic Ward Putnam, an American anthropologist, was born Apr. 16, 1839. Putnam had been curator of the Peabody Museum of American Archaeology ...

Friedrich Georg Wilhelm von Struve, a German/Danish/Russian astronomer, was born Apr. 15, 1793. Struve became director of the Dorpat Observatory ...

Thomas Thomson, a Scottish chemist, was born Apr. 12, 1773.   There were many significant chemists working in this era – Jons Berzelius, John ...

Lothar Meyer, a German chemist, died Apr. 11, 1895, at the age of 64.

Marshall Warrenn Nirenberg, an American biochemist, was born Apr. 10, 1927, in New York City.

George Peacock, an English mathematician, was born Apr. 9, 1791.