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Did you know?
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
Did you know?
Everyone has one nostril that is larger than the other.
Did you know?
The longest a person has survived after a heart transplant is 24 years.
Did you know?
During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
Did you know?
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.