Early European economy – northern Europe
Abrigo del Ciervo, Spain, ca. 6000 BC: Early European economy Hunting and gathering The first people in Europe lived by hunting and gathering; they probably had both dogs and bows [...]
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06, 2017
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06, 2017
Bering land bridge – Native Americans
Bering Strait - today there's ocean, but long ago there it was the Bering land bridge Ocean levels were lower During an Ice Age, when the world is colder, more [...]
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06, 2017
Ancient Egyptian Animals: wild and tame
Ancient Egyptian animals: Crocodiles from the New Kingdom What kind of animals lived in ancient Egypt? Mostly, the same kinds of animals lived in ancient Egypt as in other parts [...]
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06, 2017
History of pigs, pork, and bacon
History of pigs: A wild boar Where do pigs come from? The first pigs evolved in Southeast Asia from earlier, smaller mammals, about two million years ago, and spread out [...]
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06, 2017
History of dogs and wolves
History of dogs: Footprints of a child walking next to a dog, Chauvet Cave, France, ca. 24,000 BC) Where do dogs come from? Dogs are a kind of wolf. They [...]
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06, 2017
Plant food – a nitrogen project – Chemistry
A jug of nitrogen fertilizer It's pretty easy to see just how much a plant needs nitrogen to grow. Just take any two plants (they could be small house plants, [...]
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05, 2017
Roundworms, sandboxes, and pets: a project
Sandboxes can carry roundworms Roundworms are a serious health problem today in North America, especially in warm places where the cold doesn't kill them in the winter. Roundworms make kids tired, [...]
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05, 2017
Circulatory System – Biology and Evolution
Circulatory system: A dog heart What is the circulatory system? The circulatory system takes food and air from outside your body and brings it all over your body so that [...]
