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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
There are more sensory neurons in the tongue than in any other part of the body.
Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
Blood is approximately twice as thick as water because of the cells and other components found in it.
Did you know?
A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.