Thyroid conditions may make getting pregnant impossible.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
The sexual cycle of flowering plants involves alternation of sporophyte and gametophyte generations.
Gas exchange
Model for evidence-based clinical decision making.