The Dangers of Waking Up in Space

His first challenge is waking up in zero gravity. He pulls out his earplugs.

The constant hum of fans and machines is as loud as a busy city street. Without ventilation,

the CO2 exhaled by Mark would linger around his head and suffocate him in his sleep.

In zero gravity, fluids are not pulled down by weight. Faces puff and noses run.

Toilets rely on suction to keep certain things from floating. Most of the human

deposits end up in sealed bags. They're vacuum-dried, wrapped in waste capsules,

and shot to space. Some of them burn up in the atmosphere like shooting stars. Make a wish.