Things We Don’t Know

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Weight (Things We Don’t Know about Pregnancy Series #2)
We don’t know how much difference a woman’s weight or weight gain during pregnancy make for her and her baby’s health. Some effects are known, but not risk thresholds.
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Morning Sickness (Things We Don’t Know about Pregnancy Series #1)
What causes morning sickness? Why does it vary so much woman to woman? It may be linked to the placenta, and there could be evolutionary reasons for it.
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What happens to plastic when it gets disposed of into the environment, and how might it affect us?
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Going without sleep will kill you faster than going without food. But why?
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Sleep Paralysis - A Ghost Story
Why do we get sleep paralysis? Many factors affect this weird and terrifying state of half-sleeping half-waking, but there's still lots to understand.
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