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Did you know?

Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.

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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.

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Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.

A double bond between two oxygen atoms A double bond between two oxygen atoms
Three different ginkgo formulations: tablets, tea bags, and liquid extract Three different ginkgo formulations: tablets, tea bags, and liquid extract
Three different ginkgo formulations: tablets, tea bags, and liquid extract. Three different ginkgo formulations: tablets, tea bags, and liquid extract.
Effects of an inhibitor and an uncoupler on oxygen uptake and ATP synthesis Effects of an inhibitor and an uncoupler on oxygen uptake and ATP synthesis
Stable oxygen isotopes in carbonate Stable oxygen isotopes in carbonate
Video: Introduction to Eating Disorders

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