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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
There are more nerve cells in one human brain than there are stars in the Milky Way.
Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
![The stages of labor and delivery. (A) During the dilation stage the cervix thins and dilates to 10 c](https://biology-forums.com/gallery/47/medium_14755_28_08_12_1_52_24_82561428.jpeg)
![When parents actively support higher education, their children achieve more in their future careers.](https://biology-forums.com/gallery/27/medium_660366_07_04_17_11_20_45_274982379.jpeg)