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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We take fewer mental pictures per second.
- Recent memories run in our brains like sped-up old movies.
- In childhood, we capture images in our memory much more quickly.
- The complexities of grownup neural pathways are no match for the direct routes of young brains.
A consortium of scientists and engineers have proposed that the U.S. and Mexico build a series of guarded solar, wind, natural gas and desalination facilities along the entirety of the border.
- The proposal was recently presented to several U.S. members of Congress.
- The plan still calls for border security, considering all of the facilities along the border would be guarded and connected by physical barriers.
- It's undoubtedly an expensive and complicated proposal, but the team argues that border regions are ideal spots for wind and solar energy, and that they could use the jobs and fresh water the energy park would create.
It's one of the most consistent patterns in the unviverse. What causes it?
- Spinning discs are everywhere – just look at our solar system, the rings of Saturn, and all the spiral galaxies in the universe.
- Spinning discs are the result of two things: The force of gravity and a phenomenon in physics called the conservation of angular momentum.
- Gravity brings matter together; the closer the matter gets, the more it accelerates – much like an ice skater who spins faster and faster the closer their arms get to their body. Then, this spinning cloud collapses due to up and down and diagonal collisions that cancel each other out until the only motion they have in common is the spin – and voila: A flat disc.
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