The World Food Prize organization in the American state of Iowa says 17 million farmers worldwide grew GMO crops in 2012. It says the technology increased production and reduced the usage of harmful chemicals on crops.
But opposition to GMOs has been spreading. In the Philippines, protesters destroyed test fields of rice that had been genetically engineered to produce vitamin A.
EVIDENCE OF FIRST KNOWN COMET STRIKE RECOVERED
South African researchers say they have found conclusive evidence of Earth's first-ever known comet strike. The researchers say this exciting find in rural Egypt could help explain more secrets of the universe.
They say the evidence suggests the comet struck the earth about 28-million years ago, over a desert in western Egypt. They say the small particles of glassy black rock found there are comet fragments.
The South African scientists presented their findings last month at the University of the Witwatersrand in Johannesburg.
David Block is a professor at the university. He says meteor and asteroid strikes are fairly common on Earth. But a comet strike, he says, is rare and exciting.
“Because a comet is this dirty snowball of not only rock, but rock mixed with ice. And the point is that atoms, life-giving atoms of carbon, of oxygen, of nitrogen, of argon, of neon, of krypton, are encoded within this little chemical factory from beyond the solar system. …. These are grains of cosmic dust which existed prior to our solar system forming. So they contain unique secrets of the chemical compo ((composition)) of the cloud of gas and dust which collapsed to form our sun and the planets around it.”
最新
2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25