Zacharias Jansen

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Black widow spider

9 of the World’s Deadliest Spiders

The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

Los Angeles Police Department wanted flyer on Elizabeth Short, aka the "Black Dahlia," who was brutally murdered in January 1947. The FBI supported the Los Angeles Police Department in the case, including by identifying Short through her fingerprints that

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Wolfgang Amadeus Mozart. Mozart rehearsing his 12th Mass with singer and musician. (Austrian composer. (Johann Chrysostom Wolfgang Amadeus Mozart)

7 Famous Child Prodigies

Thanksgiving Celebration Traditional Dinner Setting Food Concept

Why Is Thanksgiving in the U.S. Celebrated on a Thursday?

Rural Irish landscape, Sligo, Ireland.

Why Is Ireland Two Countries?

Close-up of tobacco plants in Ontario, Canada. Tobacco, Nicotiana, cured leaves used after processing in various ways for smoking, snuffing, chewing, and extracting of nicotine.

7 of the World’s Deadliest Plants

Zacharias Jansen

Dutch optician

Learn about this topic in these articles:

contribution to diagnosis

In diagnosis: Historical aspects
…Hans Jansen and his son Zacharias. In the early 17th century, Italian philosopher, astronomer, and mathematician Galileo constructed a microscope and a telescope. The utility of microscopes in the biological sciences and for diagnostic purposes was initially realized in the late 17th century, when Dutch microscopist Antonie van Leeuwenhoek became…
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invention of compound microscope

In microscope: History of optical microscopes
…spectacle makers—Hans Jansen, his son Zacharias Jansen, and Hans Lippershey—have received credit for inventing the compound microscope about 1590. The first portrayal of a microscope was drawn about 1631 in the Netherlands. It was clearly of a compound microscope, with an eyepiece and an objective lens. This kind of instrument,…
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