From Today in Science History:
John Tyndall (born 2 August 1820, died 4 December 1893). British physicist who demonstrated why the sky is blue. His initial scientific reputation was based on a study of diamagnetism. He carried out research on radiant heat, studied spontaneous generation and the germ theory of disease, glacier motion, sound, the diffusion of light in the atmosphere and a host of related topics. He showed that ozone was an oxygen cluster rather than a hydrogen compound, and invented the firemans respirator and made other less well-known inventions including better fog-horns. One of his most important inventions, the light pipe, has led to the development of fibre optics. The modern light instrument is known as the gastroscope, which enables internal observations of a patient’s stomach without surgery. Tyndall was a very popular lecturer.
TISH provides a quote:
Their business (those who believe in evolution) is not with the possible, but the actual – not with a world which mightbe, but with a world that is. This they explore with a courage not unmixed with reverance, and according to methods which, like the quality of a tree, are tested by their fruits. They have but one desire – to know the truth. They have but one fear – to believe a lie. (1870)
Does anyone know what this quote is from?