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Christopher Columbus
Italian navigator and explorer (1451–1506)
Christopher Columbus was an Italian explorer and navigator from the Republic of Genoa who completed four Spanish transatlantic voyages in the name of the Catholic Monarchs, opening the way for the wid…
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Arrival of a spacecraft on the Moon's surface
Moon landing
A Moon landing or lunar landing is the arrival of a crewed or robotic spacecraft on the Moon. The first human-made objec…
Group of antibiotics derived from fungi
Penicillin
Penicillins are a group of β-lactam antibiotics originally obtained from Penicillium moulds, principally P. chrysogenum …
Machine for applying ink under pressure
Printing press
A printing press is a mechanical machine that transfers ink onto materials such as paper or cloth by applying pressure t…
Engine that uses steam to perform mechanical work
Steam engine
A steam engine is a heat engine that performs mechanical work using steam as its working fluid. The steam engine uses th…
Phenomena related to electric charge
Electricity
Electricity is the set of physical phenomena associated with the presence and motion of matter possessing an electric ch…
Global system of connected computer networks
Internet
The Internet is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) to …
Administration of a vaccine to protect against disease
Vaccination
Vaccination is the administration of a vaccine to help the immune system develop immunity from a disease. Vaccines conta…