Vikings led by Thor Heyerdahl established temporary colonies in North America.

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.

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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

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The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.

A scene from a kelp forest off the west coast of North America. Like terrestrial forests, kelp fores

This moose exploits the twigs and buds of woody plants for the food it needs to survive a cold north

Andy Warhol, Lance Loud, from America.

Gulf Stream/North Atlantic Current

Population Growth in America

North American Indigenous Woman

Author Question: Vikings led by Thor Heyerdahl established temporary colonies in North America. (Read 114 times)

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