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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.

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Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.

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The average office desk has 400 times more bacteria on it than a toilet.

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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).

(a) The Dmanisi cranium (right) shows similarities to early African H. erectus including the Narioko (a) The Dmanisi cranium (right) shows similarities to early African H. erectus including the Narioko
The Neandertal skull and teeth. The Neandertal skull and teeth.
The heavily worn, and sometimes cutmarked, anterior teeth of Neadertals suggest that these teeth wer The heavily worn, and sometimes cutmarked, anterior teeth of Neadertals suggest that these teeth wer
Deciduous and permanent teeth: (A) deciduous teeth, with the age at eruption given in months; (B) ... Deciduous and permanent teeth: (A) deciduous teeth, with the age at eruption given in months; (B) ...
Types, location, and structures of teeth. Types, location, and structures of teeth.
Sea Lamprey mouth, showing teeth. Sea Lamprey mouth, showing teeth.
Video: Embryonic development - Weeks 5 to 8

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