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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.

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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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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.

lung cancer cell lung cancer cell
Classes of colorectal cancer. Classes of colorectal cancer.
Men experience more trauma in their lifetimes, but women are more likely to develop PTSD. Men experience more trauma in their lifetimes, but women are more likely to develop PTSD.
Invasion and metastasis by cancer cells Invasion and metastasis by cancer cells
Opener Colored scanning electron micrograph of two prostate cancer cells in the final stages of cell Opener Colored scanning electron micrograph of two prostate cancer cells in the final stages of cell
Microarray procedure for analyzing gene expression in normal and cancer cells Microarray procedure for analyzing gene expression in normal and cancer cells
Video: Types of energy transfer reactions: oxidation-reduction reactions and ATP generation reactions

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