Scientists have found a couple of 1.9-million-year-old skeletons in a South African cave that may be "a Rosetta Stone for defining for the first time what the genus Homo is."
Scientists have found a couple of 1.9-million-year-old skeletons in a South African cave that fill in another clue from our primate past. Named australopithecus sediba, these skeletons have many features common to our genus, but also have extra-long forearms and flexible feet -- characteristics that date from deep in our primate past. It is unclear whether the skeletons belong to a direct human ancestor, but the fossils provide insight into an unknown period. "We feel that A. sediba might be a Rosetta Stone for defining for the first time what the genus Homo is," said paleontologist Lee Berger. "They’re going to be a remarkable window, a time machine."
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It's one factor that can help explain the religiosity gap.
- Sociologists have long observed a gap between the religiosity of men and women.
- A recent study used data from several national surveys to compare religiosity, risk-taking preferences and demographic information among more than 20,000 American adolescents.
- The results suggest that risk-taking preferences might partly explain the gender differences in religiosity.
She met mere mortals with and without the Vatican's approval.
- For centuries, the Virgin Mary has appeared to the faithful, requesting devotion and promising comfort.
- These maps show the geography of Marian apparitions – the handful approved by the Vatican, and many others.
- Historically, Europe is where most apparitions have been reported, but the U.S. is pretty fertile ground too.
A NASA astronomer explains how astronauts dispose of their, uh, dark matter.
- When nature calls in micro-gravity, astronauts must answer. Space agencies have developed suction-based toilets – with a camera built in to ensure all the waste is contained before "flushing".
- Yes, there have been floaters in space. The early days of space exploration were a learning curve!
- Amazingly, you don't need gravity to digest food. Peristalsis, the process by which your throat and intestines squeeze themselves, actually moves food and water through your digestive system without gravity at all.
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