Finds from Java suggest early humans reached South-East Asia by 1.6 million years ago.
These environments would have been rich in mammals that could have been hunted or scavenged by early humans.
And they say the differences may have evolved millions of years ago when early humans became hunter gatherers.
The evolutionary transition to full-time walking, which would have freed early humans' hands for using tools, clearly came later.
Language and music are results of cultural evolution harnessing auditory inputs from our natural environments environments that included the sounds other early humans made.
The dog is a much more docile creature, the likely consequence of early humans preferentially working with animals they found easier to tame.
The idea that people evolved eyes that make it easy for others to see where they are looking suggests just how important sociability was for early humans.
The authors conclude that their findings support a theory that females may have played a similarly important role in the evolution of tool technology among early humans.
The idea that virginity has a high value harkens back to the days of early humans -- if a man has sex with a virgin woman, he knows for sure that her children will be his, anthropologists reason.
Some scientists have argued that the winter conditions this would have induced could have posed an immense challenge to early humans and have pointed to some genetic studies that indicated our ancestors likely experienced a dramatic drop in numbers - a population "bottleneck" - around the time of the eruption.
But many questions remain about the genetic relationships between these early modern humans and present-day Homo sapiens populations.
The first knives date back as far as 2 and a half million years ago and were crafted by early ancestors of modern humans.
The results were so successful that Rubenstein will apply for approval from the Food and Drug Administration to start a trial that will allow him to implant the first devices in humans as early as this fall.
Animal studies have indicated STACs can restore the health and life prospects of obese mice and early-stage trials in humans are now underway.
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Anthropologists already knew of an early foray out of Africa by modern humans.
But, early on, using the compound in humans proved to be tricky.
The mystery deepened when analysis of bones from early settlements revealed smaller, weaker and sicker humans apparently worse off than their hunter gatherer neighbours.
Scientists think HIV probably crossed into humans as far back as the early 1900s, but it wasn't until air travel became common that the virus spread, and AIDS became a global epidemic in the 1980s.
The prosecutor, for his part, called it outright cruelty, telling the court that animal cruelty is usually a precursor to crimes against humans and that treating it seriously early on could lead to the possibility of rehabilitation.
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Antimicrobial experts from the UK say that it is too early to say whether the technique will work in humans as well as it does in animals.
Early tests suggest 2-heptanone may also find a role in humans as a local anaesthetic.
She said the research was still at an early stage and tests to show it is safe and effective in humans are still needed.
But humans evolved in small groups, not large collectives, so during early human history there may not have been people who were four degrees removed from anyone, they write.
As our early ancestors came down out of the trees and began moving out across the savannas, humans walked 10 to 12 miles a day to secure food.
She said all humans had the fundamental "right to dream" and described how her "early years proved to be formative for my future work as a writer and activist".
According to Stableford, early British science-fiction writers were more prone than the French to picture the encounter between humans and aliens as a brutal clash from which only the fittest would emerge alive.
The third installment in the highly acclaimed Duke Nukem series, Duke Nukem 3D is a first-person shooter game set in Los Angeles "sometime in the early 21stcentury" in which players use increasingly sophisticated weapons in order to defeat aliens and mutated humans attempting to take over the world.
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Both of those technologies for boosting memory and intelligence are in very early stages, in small animal studies only, and years (or possibly decades) away from wide use in humans.
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