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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
The largest baby ever born weighed more than 23 pounds but died just 11 hours after his birth in 1879. The largest surviving baby was born in October 2009 in Sumatra, Indonesia, and weighed an astounding 19.2 pounds at birth.
The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.
Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.
![The primate dental formula illustrated for (a) the lower dentition of an Old World monkey and (b) th](https://biology-forums.com/gallery/47/medium_275816_26_01_15_5_17_45_203701397.jpeg)
![Epidemiologists look for the causes of disease, such as toxic waste and industrial pollution, at the](https://biology-forums.com/gallery/47/medium_273688_23_02_15_7_45_12_20863285.jpeg)