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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.
![Mutualistic associations between fungi and plant roots: (a) arbuscular mycorrhizal fungus stained so](https://biology-forums.com/gallery/47/medium_33_17_02_12_5_40_33_19871612.jpeg)
![Many Native Americans have maintained continuous identity with their tribal roots. You can see the ...](https://biology-forums.com/gallery/27/medium_660366_14_04_17_2_13_59_277571380.png)