A NASA study in which astronaut Scott Kelly lived at the International Space Station for one year while his identical twin brother, Mark Kelly, remained on Earth found a 7 percent change in genes as a result of staying in space, including those involved in the immune system. What do you think?

“Oh wait, Mark was the one down here on Earth? I’ve been calling him Scott!”

Doug Newman • Cruller Braider

“Identical twins still sound weirder to me than this study.”

Natalie O’Flaherty • Snack Historian

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“What I want to know is how did this study affect their relationship as brothers?”

Timothy Bade • Sword Swallower