Leaps in the dark

Falling from grace. Joseph Glanvill: scientific witch-finder: Joseph Lannvill (1636-1680) ; The man who made underpants for frogs: Lazzaro Spallanzani (1729-1799) ; Pettenkofer's poisoned chalice (Max von Pettenkofer (1818-1901) and Robert Koch (1843-1910)

Eureka! revisited. Sir Isaac Newton and the meaning of light: Isaac Newton (1642-1727) ; Dr James Lind and the Navy's scourge (James Lind (1716-1794) ; The destruction of Ignaz Semmelweis: Ignaz Semmelweis (1818-1865)

Heroes made to measure. Will the real Johann Weyer please stand up?: Johann Weyer (1515-1588) ; Philippe Pinel: the reforging of a chain-breaker: Philippe Pinel (1745-1826)

Do-it-yourself heros. The first casualty of war: Sir Robert Watson-Watt (1892-1973) ; Rank hath its privileges: Selman A. Waksman (1888-1973).