Science & Technology General Knowledge

William Kennedy Dickson, working under Thomas Edison, developed an early motion picture camera in the late 1880s, known as the Kinetograph. Einstein was a physicist, Marconi worked on radio, and James Watt developed the steam engine.

Willem Einthoven invented the ElectroCardiogram (ECG or EKG) machine in 1903 and received the Nobel Prize in Physiology or Medicine in 1924 for this work. Karl Benz invented the automobile, Marconi worked on radio, and Tim Berners-Lee created the World Wide Web.

Alexander Fleming discovered penicillin in 1928 when he noticed mold killing bacteria in a petri dish. This revolutionized medicine and earned him the Nobel Prize. Guglielmo Marconi invented radio, Tim Berners-Lee created the World Wide Web, and Elias Howe invented the sewing machine.

Isaac Newton formulated the Law of Universal Gravitation in 1687, explaining the force that attracts objects with mass toward each other. Laszlo Biro invented the ballpoint pen, Thomas Edison developed the light bulb and phonograph, and the Wright Brothers achieved the first powered flight.

John Pemberton, a pharmacist, invented Coca-Cola in 1886 as a medicine. Laszlo Biro created the ballpoint pen, Isaac Newton discovered gravity, and Percy Spencer invented the microwave oven.

Edward Teller, a Hungarian-American physicist, is known as the 'father of the hydrogen bomb' for his work on thermonuclear weapons during the Manhattan Project. The Wright Brothers built airplanes, Isaac Newton discovered gravity, and Thomas Edison invented the light bulb.

The Wright Brothers (Orville and Wilbur) achieved the first controlled, sustained flight of a powered aircraft in 1903. Charles Babbage designed early computers, Albert Einstein developed relativity theory, and Bartolomeo Cristofori invented the piano.

Les Paul, a guitarist and inventor, pioneered the solid-body electric guitar design in the 1940s, revolutionizing popular music. Charles Babbage worked on early computers, Percy Spencer invented the microwave, and Guglielmo Marconi developed radio telegraphy.

John Browning, an American firearms designer, developed many influential automatic and semi-automatic firearms in the late 19th and early 20th centuries. Bartolomeo Cristofori invented the piano, Guglielmo Marconi developed radio, and James Watt improved the steam engine.

George Eastman invented roll film for cameras, founding the Eastman Kodak Company and making photography accessible to the public. Karl Benz invented the automobile, the Wright Brothers built airplanes, and Archimedes was an ancient Greek mathematician.

The CRH2 (China Railway High-speed) is one of China's fastest trains, with operational speeds reaching 350 km/h. While China has since developed even faster trains (like the CRH380 and Fuxing series), the CRH2 was indeed among the world's fastest when introduced.

The cheetah is the fastest land animal, capable of reaching speeds up to 112-120 km/h (70-75 mph) in short bursts. Unlike lions (which rely on group hunting) or deer and springboks (which are prey animals), cheetahs have evolved specifically for speed with lightweight bodies, non-retractable claws, and flexible spines.

The Suzuki Hayabusa is one of the fastest production motorcycles in the world, with a top speed around 300+ km/h (186+ mph). It has consistently ranked among the fastest production bikes since its introduction, outperforming the Ninja ZX-14, Yamaha R1, and BMW K1200S in top speed tests.

RIM (Research In Motion), the company that created BlackBerry, is headquartered in Waterloo, Ontario, Canada. The company was founded and remains based in Canada, not in the US, Germany, or Japan.

The average radius of Earth from the surface to the center is approximately 6,371 kilometers (6,370 km is the commonly used rounded value). This distance represents the radius of Earth's spherical shape. The other options refer to different layers or distances: 3,470 km approximates the inner core radius, 2,900 km the outer core boundary, and 4,600 km doesn't correspond to a standard Earth measurement.

The Earth's core is primarily composed of iron (Fe) and nickel (Ni), based on seismic evidence and studies of meteorites. This composition explains Earth's magnetic field and high density. P-waves and S-waves behave differently in the liquid outer core versus solid inner core.

P-waves (primary waves) are the first seismic waves recorded during an earthquake because they are compressional waves that travel fastest through Earth's materials. S-waves (shear waves) arrive later, followed by surface waves (L-waves) which cause the most damage.