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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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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.

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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.

Three ways that factors affect mortality in response to changes in population density. Three ways that factors affect mortality in response to changes in population density.
Factors that contribute to the growth of family members. Factors that contribute to the growth of family members.
Richard Meier, Atheneum, New Harmony, Indiana. Richard Meier, Atheneum, New Harmony, Indiana.
Role of Factors of Production in Determining Growth, 1975–2009 Role of Factors of Production in Determining Growth, 1975–2009
Factors Affecting the Affinity of Hb for O2 Factors Affecting the Affinity of Hb for O2
Factors Affecting the Affinity of Hb for O2 Factors Affecting the Affinity of Hb for O2
Video: Hershey Chase Experiments

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