Humans have been going into space for 50 years, but scientists are still discovering new things about what microgravity does to the human body. For example, astronauts have been reporting worsening vision since the first crewed space flights, but it wasn't until flights stretched to weeks and months at a time that the extent of this problem came to light.
Now You See Me
What's The Cause?
How Eyesight Is Affected In Space
Chris Hadfield explains the strange things that happen to an astronaut's eyes.
How Astronauts Get Eye Exams
There are no ophthalmologists in space, so astronauts are left to their own devices.
The Strange Thing About Astronaut Feet
What happens to your feet when you no longer need to walk?
How Space Affects Taste
There's a reason astronauts prefer spicy food.
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