Inventors and Scientific Discoveries

George Oliver and Edward Schäfer, British physiologists, first identified adrenaline (epinephrine) in 1894-1895 while studying extracts from adrenal glands. They discovered that injecting adrenal extracts caused increased blood pressure and heart rate, leading to the identification of this crucial hormone. This was foundational to understanding the adrenal medulla's function.

Karl Landsteiner, working in the United States, discovered the Rh blood factor in 1937 along with Alexander Wiener. Landsteiner had previously discovered the ABO blood group system (1901), making him a giant in transfusion medicine.

Willem Kolff invented the first practical dialysis machine (kidney machine) in the Netherlands during World War II (1943). His invention saved countless patients with kidney failure and pioneered the field of artificial organ replacement.

Alexander Fleming discovered penicillin in 1928 at St. Mary's Hospital in London when he noticed that mold (Penicillium notatum) killed bacteria in a petri dish. This discovery revolutionized medicine and earned him the Nobel Prize.

Jonas Salk developed the first successful polio vaccine in 1955. His inactivated virus vaccine was tested in massive clinical trials and dramatically reduced polio cases worldwide. Salk became a medical hero for refusing to patent the vaccine.

Willem Einthoven invented the electrocardiograph (ECG) in the Netherlands and received the Nobel Prize in 1924 for it. His string galvanometer could accurately record the electrical activity of the heart, revolutionizing cardiology and heart diagnosis.

Patrick Steptoe and Robert Edwards developed in vitro fertilization (IVF) in Britain, leading to the first test tube baby, Louise Brown, born in 1978. Edwards won the Nobel Prize in 2010 for this breakthrough in reproductive medicine.

Charles Babbage designed the Difference Engine in the 1820s-1830s as a mechanical calculator meant to compute polynomial functions. It was a precursor to his more complex Analytical Engine.

Ted Nelson wrote 'Computer Lib/Dream Machines' in 1974, which is widely considered the first book about personal computers. He also coined terms like 'hypertext' and was a visionary in computing.

George Westinghouse invented the air brake system for railways in 1869, which revolutionized train safety by allowing trains to stop reliably. Henry Ford (A) pioneered automobile assembly lines, Richard Drew (B) invented masking tape, and General Motors (D) is a company, not an inventor.

Laszlo Biro, a Hungarian journalist, invented the modern ballpoint pen in the 1930s. Mary Bellis (A) is a historian, Leo Hendrik (C) may refer to Baekeland (bakelite inventor), and Michael Faraday (D) worked in electromagnetism. The 'Biro' pen is named after Laszlo Biro.

Evangelista Torricelli invented the barometer in 1643. Galileo Galilei was his mentor and inspired the work, but Torricelli actually created the device to measure atmospheric pressure using mercury in a glass tube.

Jesse W. Reno invented the first working escalator in 1891, patented as the 'Endless Conveyor or Elevator.' While Nathan Ames received an earlier patent in 1859 for an 'Revolving Stairs,' his design was never actually built. Charles Seeberger later collaborated with the Otis Elevator Company to produce the first commercially successful escalator. Otis is a company, not an individual inventor.