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What is yellow fever? – History of medicine

By |2018-04-15T17:01:43+00:00September 7th, 2017|Africa, Science|

Kids with yellow fever in Mississippi about 1870. See how all the people are white? The hospital wasn't letting black kids in, or hiring black women as nurses. The virus that causes yellow fever probably evolved from an earlier virus that didn't make people sick. The first cases of yellow fever may have been in East or Central [...]

What is malaria? History of diseases and medicine

By |2018-04-24T08:21:21+00:00September 7th, 2017|Africa, Science|

A baby with malaria (from World Health Organization) You catch malaria by being bitten by a mosquito that has malaria parasites living inside it. (Female mosquitoes bite people to get blood. That gives them enough energy to make baby mosquitoes.) When the mosquito bites you, the malaria parasites go from the mosquito's mouth into your blood. [...]

What is dengue fever? History of disease and medicine

By |2018-04-25T10:34:33+00:00September 6th, 2017|Science|

Dengue history: the dengue virus - magnified many times Dengue history Probably dengue fever didn't exist before the late 1700s AD, so in the ancient and medieval worlds there was no dengue fever. Most people think that the virus that causes dengue evolved from some earlier virus that didn't make people sick. Dengue appeared all over [...]

Why do mosquitoes bite? Biology

By |2018-04-15T17:18:17+00:00May 25th, 2017|Biology|

Mosquitoes bite people: A mosquito on human skin Like bees, mosquitoes evolved from earlier flies and dragonflies about 200 million years ago, during the Jurassic period. Mosquitoes have six legs like other insects. Also like bees, mosquitoes evolved to eat pollen from the new flowers that appeared about this time. And like bees, mosquitoes [...]

What are arthropods? Biology

By |2018-04-15T17:01:39+00:00May 25th, 2017|Biology|

Bee on a flower Insects, spiders, crabs, and lobsters are all arthropods, so there are a lot of arthropods on Earth. The earliest arthropods on Earth developed about 550 million years ago. That was during the Proterozoic period. Arthropods' ancestors were a kind of worm that was divided into segments, probably distantly related to [...]