Each tonsil consists of a network of crypts (pits) that store cells used to fight infection. The tonsils contain B cells, a type of white blood cell that fights infections. They also produce antibodies against polio, streptococcal pneumonia, influenza, and numerous other infections.
Global Warming: What's Up With The Weather? is a DVD presentation of the television special by NOVA and Frontline dealing with questions raised about modern climate change.
How can I find my local wind patterns? Weather refers to the condition of Earth's atmosphere at any given time, and includes temperature, air pressure, precipitation and cloud cover. Low pressure typically causes precipitation and cloudy weather, whereas high pressure usually results in fair weather.