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Did you know?
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Did you know?
Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.
Did you know?
Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
Did you know?
There are more nerve cells in one human brain than there are stars in the Milky Way.
Did you know?
Women are 50% to 75% more likely than men to experience an adverse drug reaction.
![(a) The relative age ranges of different dating techniques depend upon the half-life of the system u](https://biology-forums.com/gallery/47/medium_274477_04_02_15_12_24_31_205741018.jpeg)
![Medicinal leeches on a patient’s neck. Today leeches are sometimes used in microsurgery to prevent b](https://biology-forums.com/gallery/47/medium_374628_15_08_15_11_50_50_222302203.jpeg)