Tag: "prehistoric" at medical news

Dark skin protects

...rosine, which is also needed to build proteins. In prehistoric days when food was scarce in cold, dry areas, tyrosine was probably conserved to make essential proteins, Mackintosh says. It was only worthwhile converting it into extra melanin in the warm, damp tropics where food was abundant and pathogens were ra...

Man's Transition from Foragers to Agriculturalist Led to Increase in Birth Rates

...the Neolithic period. Anthropologists studied 60 prehistoric American cemeteries to prove the fact that agriculture played a very important role in worldwide increase in birth rate. When assessing the shifts in the demographic pattern prior and after agriculture was discovered in Europe there was a sudden in...

Mystery behind the evolution of the Human brain

...nd lake shorelines were dominated in east Africa's prehistoric Rift Valley in which the early humans evolved. This was supported by Dr. Kathy Stewart from the Canadian Museum of Nature, in Ottawa. Her study of fossil material excavated from the sites in eastern Africa revealed a bevy of chewed fish bones, partic...

Will The Tropical Forests Survive The Deforestation Scenario?

...re recently in selected areas that supported large prehistoric human populations. "Despite many caveats, our projections for forest cover provide hope that many tropical forest species will be able to survive the current wave of deforestation and human population growth," stress Wright and Mueller-Landau. "Cre...

Falls and Hip Fractures Are Not Inevitable

...n cars and in front of computers and TV unlike our prehistoric hunting and gathering ancestors who had to walk and climb over rocks and roots during the day. Even when function is reduced or seemingly lost, with training it may be regained, as in “use it and it regenerates.” The following categories are key t...

DNA Sample Suggests Greenland was Much Warmer During Last Ice Age

...eated a perfect, natural 'freezer' to preserve the prehistoric DNA. Scientists have, in the past, found older organic matter, but they have not found any uncontaminated DNA that is as old or older than the Greenland samples....

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