The excitement of learning separates youth from old age. As long as you’re learning, you’re not old.
– Rosalyn Yalow
(b. 1921) American medical physicist. In 1977 she became the second woman to be awarded the Nobel prize in Physiology or Medicine. She shared the award with Roger Guillemin and Andrew Schally for the development of the radioimmunoassay (RIA) technique.