IN a paper on secondary radiation from gases subject to X-rays (Phil. Mag. [6] v., p. 685, 1903), I described experiments which led to the conclusion that this radiation is due to what may be ...

Röntgen found that this was, indeed, the case; but he also noticed that his primitive fluorescent screen was now glowing brightly. The discovery of X-radiation had been made.

By coincidence, at the same time researchers at neighbouring Princetown University were looking for radiation they believed was left over from the Big Bang. They realised Wilson and Penzias ...