Supernova may be linked to human evolution
Debris from a supernova, that is, the explosion of a star, fell on the earth about 2.8 million years ago, and this may have affected the course of human evolution. Physicists looking at a chunk of ocean floor found traces of a certain kind of iron that could only have been made by a supernova. The explosion of the star would have spewed out huge amounts of cosmic rays-enough, say scientists, to dramatically alter our climate. More clouds would have spread out over the Earth, which would have cooled the planet. This in turn would have locked more water up in ice at the poles, and created a drier climate. Africa would have been particularly dry, and many have argued that it was this dry shift that caused our proto-human ancestors to move into wetter climates, where they ultimately evolved into humans.
-Zoe Cormier
Source: Nature
Classical Cosmetic
Archaeologists have discovered that a mysterious Roman container found last summer in London contains an ancient cosmetic. At first they thought the contents might be toothpaste or a ceremonial goat covering. But after analyzing the contents (fat and starch), they believe the pale cream was used as makeup, much like modern foundations. Finger marks can still be seen in the smooth paste.
-Z.C.
Source: Nature
California OKs stem cell research
In yesterday’s election 59 per cent of Californians voted “yes” on Proposition 71, which will grant $3 billion for stem cell research. This makes it the first US state to fund the controversial research, which has been restricted by President George Bush Jr. In addition to scientists, wealthy investors, and the late Christopher Reeve, Republican Governor Arnold Schwarzenegger endorsed the bill, going against the mandate of his party. It is hoped stem cell research could lead to cures for a huge variety of diseases, including Parkinson’s and Alzheimer’s, which former Republican president and icon Ronald Reagan died of this year.
-Z.C.
