Kopra replaced Scott Kelly as the ISS commander when the latter stepped down after spending a year in space. If you still haven't figured out Snapchat -- and there's no shame in that -- you can access Live Stories by clicking the hamburger menu at the bottom right of the app's interface. This takes you to a new tab where you can search for NASA's account. Add it, and you'll be able to watch the agency's "Day in Space" videos anytime.