Radio is the transmission of signals, by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of...

Radon (pronounced /ˈreɪdɒn/) is a chemical element that has the symbol Rn and atomic number 86. Radon is a radioactive noble gas that is formed by the decay of radium. It is one of the heaviest gases and is considered to be a health hazard. The most...

Alexander Rado (1899-1981), a Hungarian-born Soviet military intelligence agent

Rado, Swiss watch manufacturer

Gaby Rado (1955-2003), a British television journalist

Elisabeth Rado (1899-1986), a Yugoslavian opera singer

James Rado (James Radomski, 1932-), an American actor

Tibor Radó (1895-1965), a Hungarian mathematician

Richard Rado (1906-1989), a German mathematician

Rado, mayor of the palace of Burgundy from 613 to 617