Science & Technology
But several experts said it was unlikely that the technique would significantly alter the controversial work of California's $3 billion stem cell institute, which focuses on cells derived from discarded three-to-five day old embryos. The experts include recipients of the institute's grants.
Following on work done by Japanese scientists last year, the teams reported in the journals Nature and Cell Stem Cell that they had reprogrammed mouse skin cells to behave like embryonic cells, dubbed "pluripotent" because they can turn into any tissue in the body.
The report indicates that, on average, children begin using electronic devices at 6.7 years old, down swiftly from 8.1 years in 2005.
Portable game consoles were found to be the electronics that kids were most likely to have, with 39 percent of those surveyed owning one. Console hardware pulled a slightly lower adoption rate among children, at 29 percent.
These finds of handmade beads, in a limestone cave in Morocco, suggest that humans were fashioning purely symbolic objects in Africa 40,000 years before they did it in Europe. A paper on the discovery is published in this month's Proceedings of the National Academy of Sciences.
The discovery of beads at the Grotte des Pigeons, Taforalt, in Eastern Morocco was made by an international team of archaeologists from the UK, Morocco, France and Germany, led by Oxford University's Institute of Archaeology.
Twelve Nassarius shells were perforated in their centres, and showed signs of being suspended or hung. They also appeared to have been covered in red ochre, like other less well-dated African beads. These symbolic, decorative objects are considered early signs of modern human behaviour and mark shifts in human development. Similar beads have been found at sites from Algeria, Israel, and South Africa, which probably date back to about the same time or slightly after the finds from Taforalt.
Since the bicycle's invention some time in the 1860s, mathematicians have tried to sum up bike riding with equations based on Newton's laws of motion.
One of the first attempts dates back to pioneering work in 1897 by French mathematician Emmanuel Carvallo. In 1899, the Cambridge undergraduate Francis Whipple had a go, using equations that had more general applicability (though were slightly wrong).
Today, in the journal Proceedings of the Royal Society, a conclusive mathematical account of bike riding is described in a dense 28-page paper by Professor Andy Ruina of Cornell University, Jim Papadopoulos of Green Bay, Wisconsin, Jaap Meijaard of Nottingham University, and Prof Arend Schwab of Delft University of Technology, the Netherlands.
It was once thought that the stability is because the wheels act like gyroscopes to keep the bike upright.
Images captured from space pinpoint telltale signs of previous habitation in the swatch of land 200 miles south of Cairo, which digging recently confirmed as an ancient settlement dating from about 400 A.D.
The find is part of a larger project aiming to map as much of ancient Egypt's archaeological sites, or "tells," as possible before they are destroyed or covered by modern development.
"It is the biggest site discovered so far," said project leader Sarah Parcak of the University of Alabama at Birmingham. "Based on the coins and pottery we found, it appears to be a massive regional center that traded with Greece, Turkey and Libya."
The geological oddity measures some 330 feet (100 meters) across and is located on an otherwise bright dusty lava plain to the northeast of Arsia Mons, one of the four giant Tharsis volcanoes on the red planet.
The hole might be the sort of place that could support life or serve as a habitat for future astronauts, researchers speculated.
Must be deep
The Mars Reconnaissance Orbiter (MRO) used its High Resolution Imaging Science Experiment (HiRISE) instrument to draw a bead on the apparent deep hole-a feature that may cause more scientists to ponder about potential subsurface biology on Mars.
The Iceman is a uniquely well-preserved late Neolithic glacier mummy, found in 1991 in South Tyrol at 3,210 meters above sea level. He has undergone various scientific examinations, as human bodies are the best source for the study of life conditions in the past as well as the evolution of today's diseases.





