Telescope earliest existing record of a telescope was a 1608 patent submitted to the government in the Netherlands by Middelburg spectacle maker Hans Lippershey for a refracting telescope. The actual inventor is unknown but word of it spread through Europe. [[Galileo Galilei|Galileo]] heard about it and, in 1609, built his own version, and made his telescopic observations of celestial objects. The idea that the [[Objective (optics)|objective]], or light-gathering element, could be a mirror instead of a lens was being investigated soon after the invention of the refracting telescope. The potential advantages of using [[parabolic reflector|parabolic mirrors]]—reduction of [[spherical aberration]] and no
Janssen Pharmaceutica Johnson. The early roots of what would become Janssen Pharmaceutica date back to 1933. In 1933, Constant Janssen, the father of Paul Janssen, acquired the right to distribute the pharmaceutical products of Richter, a Hungarian pharmaceutical company, for Belgium, the Netherlands and Belgian Congo. On 23 October 1934, he founded the "N.V. Produkten Richter" in Turnhout. In 1937, Constant Janssen acquired an old factory building in the "Statiestraat 78" in Turnhout for his growing company, which he expanded during World War II into a four-storey building. Still a student, Paul Janssen assisted in the development of paracetamol (USP: acetaminophen, often