There are more nerve cells in one human brain than there are stars in the Milky Way.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.
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Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.
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Vaccines prevent between 2.5 and 4 million deaths every year.
Historian James Merrell notes several errors in Benjamin West’s famous 1771 painting, William Penn’s
Source Regions: Air Masses
Continental Polar (cP) and Continental Arctic (cA) Air Masses