GK (Discoveries and Inventions)

Isaac Newton invented calculus in the mid-17th century, independently developing fundamental concepts like derivatives and integrals. While Gottfried Leibniz also developed calculus around the same time, Newton is widely credited as one of the primary inventors and his work predated Leibniz's publication. The other options are incorrect: Appert (food preservation), Sony (electronics company), and Wilmut (cloning).

Erik Rotheim, a Norwegian chemical engineer, invented the aerosol spray can in 1926, receiving a patent for his design that used pressurized gas to propel liquid contents. This invention revolutionized the delivery of products from insecticides to hair spray. The other names are associated with different inventions: Kolff (dialysis machine), Moseley (X-ray spectra), and Newton (calculus).

The Montgolfier brothers, specifically Jacques-Étienne Montgolfier (referred to as 'Jacques'), invented the hot air balloon in 1783. They demonstrated the first manned balloon flight in Paris. While Jacques is listed, it's worth noting this was a collaborative invention with his brother Joseph-Michel. The other options refer to different scientists: Dalton (atomic theory), Tennant (bleach powder), and Ohain (jet engine).

The audio cassette (Compact Cassette) was invented by the Dutch company Philips in 1962, with Lou Ottens leading the development team. It became a dominant audio format for decades. The other options are incorrect: Ehrlich (chemotherapy), John Harrison (marine chronometer), and Boyer (recombinant DNA technology). Philips developed both the cassette tape and the cassette format standard.

Ian Wilmut led the team that cloned Dolly the sheep in 1996, pioneering somatic cell nuclear transfer technology.

Philips, in partnership with Sony, pioneered optical disc technology including LaserDisc and Compact Disc.

J.J. Thomson discovered the electron in 1897 through cathode ray tube experiments, for which he received the Nobel Prize.

IBM invented the floppy disk in 1971 as a convenient medium for storing and transferring computer data.

Sir George Cayley designed the first successful glider in 1849, establishing the principles of aerodynamics.

Stephanie Kwolek synthesized Kevlar at DuPont in 1965, creating a lightweight fiber five times stronger than steel.

Edmund Cartwright patented the power loom in 1785, revolutionizing textile manufacturing by mechanizing weaving.

John Walker invented the first friction match in 1827, which later evolved into the modern safety match.

Dr. Paul Zoll developed the first external cardiac pacemaker in 1952, pioneering life-saving heart rhythm regulation.

Gottlieb Daimler and Wilhelm Maybach built the first gasoline-powered motorcycle, the Reitwagen, in 1885.

Bartolomeo Cristofori invented the piano around 1700 in Florence, calling it the gravicembalo col piano e forte.

Richard Hoe invented the rotary printing press in 1843, which dramatically increased printing speed and efficiency.

King C. Gillette invented the safety razor with disposable blades in 1901, revolutionizing shaving. Einstein was a physicist, Walter Hunt invented the safety pin, and Libby developed radiocarbon dating - none are associated with razor technology.

Volvo introduced the three-point seatbelt in 1959, invented by Nils Bohlin. The company famously made the patent open for all manufacturers to save lives. Bell Labs worked on semiconductors, Moog developed electronic music synthesizers, and Laennec invented the stethoscope.

Margarete Steiff, a German seamstress, created the first teddy bears in the early 1900s after seeing a bear cub illustration. Samuel Morse invented the telegraph, Bell Labs developed transistors, and Stephanie Kwolek invented Kevlar fiber.

William Oughtred, an English mathematician, invented the slide rule in the 1620s based on logarithms developed by John Napier. Richard James invented the Slinky, JC Perrier was a French engineer, and Karl Elsener founded Victorinox (Swiss Army knives).

Alexander Graham Bell patented the telephone in 1876. Colt is associated with firearms, Talbot with early photography, and Margarete Steiff with teddy bears. Bell's work on voice transmission built on earlier experiments by Meucci and others.

David Bushnell built the Turtle in 1775, the first military submarine used during the American Revolutionary War. While earlier submersibles existed, Bushnell's Turtle was the first one-person combat submarine with a propeller. Bell Labs is a research institution, James Watt improved the steam engine, and William Oughtred invented the slide rule.