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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
Cyanide works by making the human body unable to use oxygen.
Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.
![Shown here is Sigmund Freud in 1931 as he poses for a sculptor in Vienna, Austria. Although Freud ...](https://biology-forums.com/gallery/47/medium_660365_19_12_16_11_52_43_24338948.png)
![The major cortical input and output pathways of the posterior parietal association cortex. Shown are ...](https://biology-forums.com/gallery/30/medium_548020_06_06_17_12_22_53_303282416.png)