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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
Your heart beats over 36 million times a year.
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.
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.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
![The image formed on the retina is inverted. The brain rights the image as part of the interpretation](https://biology-forums.com/gallery/47/medium_14755_27_08_12_12_24_59_81982202.jpeg)
![A strike by 800 women shoemakers in Lynn, Massachusetts, in 1860. In 1851 a Lynn shoemaker had adapt](https://biology-forums.com/gallery/47/medium_375552_19_08_15_9_09_53_223271453.jpeg)