When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Did you know?
Approximately 500,000 babies are born each year in the United States to teenage mothers.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.
Charophycean green algal relatives of the land plants.
USA—the land of diversity.
Waterspouts are tornadoes that occur over warm-water bodies, instead of over land.
Changes in Land Configuration and Surface Characteristics
Model for ecosystems on land
A very small sampling of organisms in an arctic food web on land.