Scientists have debated for decades whether the human brain sprouts new neurons throughout life. What would it mean if it could — and how much evidence is enough?

The 14th test flight marks a crucial milestone toward the company’s ambitions of sending people to the moon and Mars, but it was not a complete success. By Kenneth Chang A previous mission left two ...

We may receive a commission on purchases made from links. We got to share in a rare moment of collective awe this week as four astronauts blasted off toward the moon, beginning a 10-day journey that ...