Scientists say the Earth will warm in response to increasing carbon dioxide levels in the atmosphere, but since the 1970s, they have not made much headway in narrowing down exactly how much it will warm.
Roughly 100,000 years ago, human evolution reached a mysterious bottleneck: Our ancestors had been reduced to perhaps five to ten thousand individuals living in Africa. In time, “behaviorally modern” humans would emerge from this population, expanding dramatically in both number and range, and replacing all other co-existing evolutionary cousins, such as the Neanderthals. The cause…
A pair of mathematicians have proposed a unified theory of dark matter and dark energy that alters Einstein’s equations describing the fundamentals of gravity. The researchers suggest the law of energy and momentum conservation in spacetime is valid only when normal matter, dark matter and dark energy are all taken into account. For normal matter…
In a new study from the Proceedings of the National Academy of Sciences, mouse brain cells implanted into rats survived as long as the rats did, double the average mouse lifespan. This runs contrary to one theory of aging that holds that our life spans are genetically determined, and cells in our body will die…
New research suggests that global warming is causing the cycle of evaporation and rainfall over the oceans to intensify more than scientists had expected, an ominous finding that may indicate a higher potential for extreme weather in coming decades. By measuring changes in salinity on the ocean’s surface, the researchers inferred that the water cycle…
The discovery of a major gear in the biological clock that tells the body when to sleep and metabolize food may lead to new drugs to treat sleep problems and metabolic disorders, including diabetes. Scientists at the Salk Institute for Biological Studies showed that two cellular switches found on the nucleus of mouse cells, known…
Earth’s ecosystems keep soaking up more carbon as greenhouse gases accumulate in the atmosphere, new measurements find. The research contradicts several recent studies suggesting that “carbon sinks” have reached or passed their capacity. By looking at global measurements of atmospheric carbon dioxide, the new work, presented at an annual conference on global monitoring, calculates instead…