Bacteria : Anton van Leeuwenhoek, The Netherlands, 1683.

Bakelite : Leo Hendrik Baekeland, U.S.A., 1907.

Ball Bearing : Philip Vaughan, England, 1794.

Ballon, Hot-air : Joseph and Jacques Montgolfier, France, 1783.

Bar Codes : Monarch Marking, U.S.A. 1970.

Barometer : Evangelista Torricelli, Italy, 1643.

Bicycle : Karl D. von Sauebronn, Germany, 1816; (first modern model) James Starley, England, 1884.

Big Bang Theory : (the universe originated with a huge explosion) George LeMaitre, Belgium, 1927; (modified LeMaitre theory labeled “Big Bang”) George A. Gamov, U.S.A., 1948; (cosmic microwave background radiation discovered) Arno A. Penzias and Robert W. Wilson, U.S.A. 1965.

Blood, Circulation of : William Harvey, England, 1628.

Bomb, Atomic : J. Robert Oppenheimer et al., U.S.A., 1945.

Bomb, Thermonuclear (hydrogen) : Edward Teller et al., U.S.A., 1952.

Boyle’s Law : (relation between pressure and volume in gases) Robert Boyle, Ireland, 1662.

Braille : Louis Braille, France, 1829.

Bridges : (suspension, iron chains) James Finley, Pa., 1800; (wire suspension) Marc Seguin, Lyons, 1825; (truss) Ithiel Town, U.S.A., 1820.

Bullet : (conical) Claude Minie, France, 1849.