Modern medical advances have helped millions of people live longer healthier lives. We owe these improvements to decades of investment in medical research.
There's a lot of interest from the medical community on how things develop in microgravity and the hope later that is expected to apply to what the changes are in humans as well.
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After I read all the medical journals and watched all the documentaries I still didn't understand the physical sensation of ticking and where it comes from and what it feels like.