The negative result of the Michelson-Morley experiment which caused the aether theory to be abandoned. It is the basis of Albert Einstein's theory of relativity,
... 6.1% from 18 to 24, 24.6% from 25 to 44, 28.2% from 45 to 64, and 20.7% who are 65 years of age or older. The median age is 44 years. For every 100 females there are ...