We find out why blood donations aren't rejected more readily. Plus we ask, is sleepiness related to cheerfulness? Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

We find out why blood donations aren't rejected more readily. Plus we ask, is sleepiness related to cheerfulness? Like this podcast? Please help us by supporting the Naked Scientists

We find out why blood donations aren't rejected more readily. Plus we ask, is sleepiness related to cheerfulness? Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate" rel="noopener noreferrer">supporting the Naked Scientists</a>

Why aren't blood donations rejected?

Each week we set out to solve one of the world's weirdest, wackiest, funniest and funkiest scientific puzzles. And along with the answer there's a brand new question to think about for next time...

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Why aren't blood donations rejected?

Why aren't blood donations rejected?

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