1 ° April 1960 - NASA launches the first weather satellite, TIROS-1, for the purpose of testing experimental techniques for shooting television images that show the Earth's meteorological situation from space
1 ° April 1976 - In the Jobs family garage in Cupertino, California, the Apple Computer Company founded by Steve Jobs and Steve Wozniak
1 ° April 1984 - In the space of a few hours, one bradyseismic swarm of about 500 shocks hits Pozzuoli
3 April 1961 - To celebrate the trip to South America of the then President of the Republic Giovanni Gronchi, the stamp is issued “Pink congers”. It will become a very rare piece of Italian philately because it presents an error in the geographical representation of the borders of Peru
3 April 1973 - Martin Cooper, American inventor and entrepreneur, carries out the first call with a mobile phone prototype
3 April 2003 - He comes approved the MOSE project, the system of mobile dams aimed at defending the city of Venice and its lagoon from the phenomenon of high water
4 April 1932 - Charles Glen King and Albert Szent-Gyorgyi discover L-ascorbic acid, more commonly known as Vitamin C
4 April 1969 - US heart surgeon Denton Cooley is the first doctor in the world to perform theimplantation of an artificial heart on a human being
4 April 1975 - In Albuquerque, US computer scientists Bill Gates and Paul Allen found the Microsoft
5 April 1817 - Baron Karl Drais, German inventor, presents to the public the draisine: with two wheels, one of which is steering, it is the first bicycle in history
5 April 1853 - From the Capodimonte Astronomical Observatory, the Italian astronomer and mathematician Hannibal de Gasparis discovers 24 Themis, one of the largest main-belt asteroids
6 April 1973 - From the Cape Canaveral base, NASA launches into orbit Pioneer 11, the first space probe to fly-by Saturn
6 April 2009 - A 6.3 magnitude earthquake hits L'Aquila and central Italy, causing 309 victims, thousands of displaced people and huge material damage
7 April 1948 - The UN establishes theWorld Health Organization (WHO) based in Geneva, Switzerland
9 April 1770 - The British explorer James Cook docks in Botany Bay for the first time, a bay in Sydney, Australia, which he reached during his famous first expedition in the Pacific
10 April 1849 - American inventor Walter Hunt patents the safety pin
10 April 1926 - The Norge airship by Umberto Nobile departs from Ciampino: it will arrive as far as King's Bay in Norway and then in Alaska after being the first to fly over the North Pole
10 April 2019 - After two years of surveys by the radio telescopes of the Event Horizon Telescope international project, the image of a black hole is shown for the first time
10 April 1815 - In Indonesia the paroxysmal phase of theTambora eruption, the most powerful volcanic eruption ever recorded in historical times (with an explosiveness index of 7, on a scale ranging from 0 to 8) which, due to the ashes scattered all over the world by the eruptive column, made 1816 the so-called “year without summer”
11 April 1976 - The computer is introduced Apple I, the first Apple Computer product designed by Steve Wozniak and Steve Jobs, just 10 days after the company was founded: it will be marketed starting in July at a cost of $666,66
12 April 1633 - Starts in Rome on trial of Galileo Galilei, supporter of the heliocentric Copernican theory on the motion of celestial bodies, in contrast to the geocentric one supported by the Catholic Church
12 April 1961 - The Soviet Yurij A. Gagarin is the first man to fly into space in orbit around the Earth aboard the Vostok 1 mission, the first manned one
13 April 1895 - During archaeological excavations in Boscoreale, a few kilometers from Pompeii, the remains of the villa of Publio Fannio Sinistore come to light buried by the great eruption of Vesuvius in 79 AD
13 April 1970 - An oxygen container explodes on board Apollo 13: it will be remembered as the accident that forced the crew to launch the now famous message "Okay, Houston, we've had a problem here!"
15 April 2010 - The Icelandic volcano Eyjafjallajokull erupts causing a cloud of ash that covers a large part of Europe, causing the closure - until the early hours of April 19 - of a large number of airports on the continent to avoid the risks associated with air navigation
16 April 1943 - Swiss chemist Albert Hoffmann unintentionally discovers psychedelic effects of lysergic acid (LSD), which he synthesized five years earlier: the accidental fall of a few drops of substance on his hand causes hallucinations and severe dizziness
17 April 1524 - The Italian navigator Giovanni da Verrazzano lands in New York Bay
17 April 2014 - The scientific journal 'Science' officially announces the discovery of Kepler-186 f, an exoplanet orbiting the red dwarf star Kepler-186, initially described as the first exoplanet with a radius similar to that of Earth and falling within the so-called "habitable zone". However, subsequent calculations have revised upwards the distance from our planet and the dimensions of Kepler-186 f, now considered more similar to a 'super Earth'
18 April 1902 - Denmark introduces the use of fingerprints for the identification of criminals. Already in 1788 the German anatomist Johann Mayer had described the recurring characteristics affirming the uniqueness of the papillary impressions from individual to individual
20 April 1902 - Pierre and Marie Curie, together with Andre Debierne, announce that they have succeeded in isolate radium, an element discovered four years earlier together with polonium by the famous pair of physicists
21 April 1972 - Apollo 16 touches down on the moonThis is the tenth manned mission of NASA's Apollo program
22 April 1970 - A proclamation written by peace activist John McConnell and signed by United Nations Secretary-General U Thant sanctions the birth of Earth Day, the Earth Day born to underline the need for the conservation of our planet's natural resources and which has become, over time, an educational and informational event worldwide
22 April 1994 - Polish astronomer Aleksander Wolszczan announces the premiere discovery of two exoplanets
23 April 1946 - Enrico Piaggio, of Piaggio & CSpA, obtains the Vespa patent. The innovative and iconic Italian motorcycle was designed by the aeronautical engineer Corradino D'Ascanio who, detesting motorcycles, invented the first motorcycle with a load-bearing body, without a tubular steel structure and, therefore, without a central tunnel
23 April 1984 - The announcement is made in Washington of theidentification of HIV, the virus responsible for AIDS
23 April 2005 - With the registration of the first user it is launched YouTube, the web platform for sharing and viewing video content: "Me at zoo" is the title of the first video uploaded by one of the site's founders, Jawed Karim
24 April 1934 - In Chicago, US engineer Laurence Hammond announces the invention of theHammond, the electric organ without pipes
24 April 1990 - The Space Shuttle Discovery shuttle puts the Hubble Space Telescope, one of the largest and most versatile
25 April 1953 - Ornithologist James D. Watson and physicist Francis Crick announce the discovery of the double helix structure of DNA
26 April 1986 - A Chernobyl, in the Soviet Union, theexplosion of a nuclear reactor in a nuclear power plant it causes a radioactive cloud which will contaminate a large part of Europe in the following days and weeks
26 April 2017 - The Cassini space probe, launched in 1997 with the task of studying Saturn and its moons, performs its last manoeuvre: a dive between the planet's rings
29 April 1861 - From the Dusseldorf Observatory, Germany, astronomer Karl Theodor Robert Luther discovers 68 Leto, a large main-belt S-type asteroid
30 April 1876 - The German doctor Robert Koch succeeds for the first time in isolate a bacterium outside the body. It is the Bacillus anthracis, dangerous bacterium cause of anthrax, acute infectious disease