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In 1864, the first barbiturate (barbituric acid) was synthesized.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

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Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.

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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

human body human body
Schematic map of the human mitochondrial genome. Schematic map of the human mitochondrial genome.
A section through the human brain A section through the human brain
Human mitotic metaphase chromosomes are identified by size, centromere location, and banding pattern Human mitotic metaphase chromosomes are identified by size, centromere location, and banding pattern
Fluorescent in situ hybridization (FISH) of human metaphase chromosomes Fluorescent in situ hybridization (FISH) of human metaphase chromosomes
Apoptosis in the formation of a human hand Apoptosis in the formation of a human hand
Video: Reflex arc construction

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