Calendar Of Science

Every month, Pacific Science Center publishes a Calendar of Science, a compendium of science facts to add a little knowledge to your daily routine. So, read on and discover a few things you may not have known. If you would like to receive a daily dose of science, subscribe to Calendar of Science on Twitter. We've also set up a Google Calendar to which you may subscribe. Have a comment or question? Please drop us a line. Remember, life's boring without discovery!


April 1, 1578-Birthday of physician William Harvey, who discovered the circulation of blood.
April 2, 1618-Birthday of physicist Francesco Grimaldi, discovered that light produces an interference pattern, is a wave phenomenon.
April 3, 1973-Engineer Martin Cooper made the first phone call using a hand-held portable cell phone.
April 4, 1966-Luna 10 became the first spacecraft to orbit the moon.
April 5, 1753-The British Museum was founded in London by an Act of Parliament. It opened to the public 6 years later.
April 6, 1909-Explorers Robert Peary and Matthew Hensen became the first people to reach the North Pole.
April 7, 1795-France became the first country in the world to adopt the metric system of measurement.
April 8, 1869-Birthday of physician Harvey Cushing, discovered the function of the pituitary gland.
April 9, 1770-Birthday of physicist Thomas Seebeck, studied electric current, discovered what is now known as the Seebeck effect.
April 10, 1917-Birthday of chemist Robert Woodward, who synthesized cortisone, quinine, and vitamin B12.
April 11, 1984-Space shuttle astronauts George Nelson & James van Hoften made the 1st in-space repair of a satellite.
April 12, 1961-Cosmonaut Yuri Gagarin became the first person to travel into space.
April 13, 1913-Birthday of inventor Robert Hingson, who invented the jet injector for giving inoculations without a hypodermic needle.
April 14, 1954-Physicist Gordon Teal built the first transistor made of silicon. Previous transistors had been made of germanium.
April 15, 1452-Birthday of Leonardo da Vinci, who designed (but did not build) a helicopter, a parachute, and a pendulum clock.
April 16, 1972-Two giant pandas from China, Hsing-Hsing and Ling-Ling, became residents of the National Zoo in Washington, D.C.
April 17, 1880-Birthday of archaeologist Leonard Woolley, who discovered and excavated the ancient Sumerian city of Ur in southern Iraq.
April 18, 1906-The most destructive earthquake in U.S. history occurred in San Francisco.
April 19, 1912-Birthday of chemist Glenn T. Seaborg, who led a team which created nine of the trans-uranium elements (numbers 94 to 102).
April 20, 1902-Chemists Marie and Pierre Curie successfully isolated 1 gram of radium from 8 tons of pitchblende ore.
April 21, 1838-Birthday of naturalist John Muir, who advocated the establishment of Sequoia and Yosemite national parks.
April 22, 1724-Birthday of philosopher Immanuel Kant, 1st to suggest that some nebulas were galaxies seen from a great distance.
April 23, 1941-Birthday of electrical engineer Ray Tomlinson, invented 1st email system which could send email from one computer to another.
April 24, 1925-John Scopes, a high school teacher in Dayton TN, taught his class about evolution.
April 25, 1990-The Hubble Space Telescope was placed into orbit 381 miles above the Earth.
April 26, 1900-Birthday of geologist Charles Richter, who invented the Richter scale for measuring earthquake intensity.
April 27, 1871-The American Museum of Natural History opened in New York City.
April 28, 2005-Ornithologists at Cornell U. announced they had sighted an ivory-billed woodpecker in Arkansas. Thought extinct for 60 yrs.
April 29, 1854-Birthday of Henri Poincaré, who was 1st to suggest that nothing can travel faster than the speed of light in a vacuum.
April 30, 1897-Physicist J.J. Thomson announced his discovery of the electron. It was the first subatomic particle to be discovered.