Yahoo is using AI to generate takeaways from this article. This means the info may not always match what's in the article. Reporting mistakes helps us improve the experience.Generate Key TakeawaysUsing previously awarded federal funding, marine life ...

Twin brothers and former NASA astronauts Mark and Scott Kelly have each flown four missions and were part of NASA's twin study to research the impact of spaceflight on the human body.Hours beforeSpaceX planned to launchanother crew to the Internation...