Frank Borman commanded two early NASA missions including Apollo 8, the first to orbit the moon. He was a no-nonsense astronaut known for his keen attention to detail and duty to country.

A new study of astronaut blood finds that space travel reduces the expression of 100 genes related to the immune system.

All week, On Second Thought has shared stories about people whose unsung contributions to the Apollo 11 mission 50 years ago. One of those pioneers is...