For in 1900 all electromagnetic radiation of longer wavelengths was already known at least to the extent that one could not seek in it the more striking characteristics of X-rays such as, for example, the strong penetrating power.
-- Max von Laue
   
Max von Laue   Name:
Max von Laue
Type:
Scientist
Nationality:
German
https://www.nutquote.com/quote/Max_von_Laue