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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
Cyanide works by making the human body unable to use oxygen.
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.
![The thymus gland. This gland lies in the mediastinum of the thoracic cavity, just above the heart. I](https://biology-forums.com/gallery/47/medium_14755_28_08_12_1_42_28_82392384.jpeg)
![Erythroblastosis fetalis. (a) The condition occurs with an RH+ father and RH– mother. (b) First preg](https://biology-forums.com/gallery/47/medium_14755_16_10_12_12_29_18_9451500.jpeg)