NASA Astronauts Finally Return, Seals Hold Their Breath, and Penguin Poop Stresses Out Krill

Two NASA astronauts are finally back on Earth after an unexpected
nine-month stay in space. What kept them up there so long?
Meanwhile scientists have discovered that gray seals have a
built-in oxygen gauge that helps them hold their breath for more
than an hour. And in the Antarctic, researchers found that penguin
poop seriously stresses out krill. Catch up on these stories and
more in our Monday news roundup. Recommended reading: After 286
Days in Space, NASA Astronauts Return to Earth with a Splash 
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