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So, if it helps you relieve anxiety, a weighted blanket may also help with your restless legs. Dairy products and foods heavy in sugar have also been reported to trigger restless legs. Of course, home remedies have their limits. Vensel-Rundo says, as their lack of sleep can cause depression and anxiety. Share this article via email with one or more people using the form below.

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Trending Topics. They are the earliest indisputable evidence that our distant ancestors had shifted from four legs to two, becoming "bipeds".

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  8. Exactly why and when our ancestors stood upright and started moving around on two feet is still shrouded in mystery. The scientific community disagrees over what led early humans to abandon a life on all fours — even though it is clearly one of the defining traits of our species. However, cutting-edge research is now providing fresh clues as to what may have driven this change.

    Understanding how we came to be the bipedal creatures we are today promises to answer many of the fundamental questions we have about the evolution of our species. It is widely recognised that permanently standing up opened up new opportunities for our ancestors to touch, explore, pick up, throw and learn. Ultimately, it may have been a key step that led our ancestors' brains to grow. Our earliest "human" predecessors are thought to have diverged from the common ancestor we share with chimpanzees sometime between 13 million and six million years ago.

    Most scientists agree these creatures lived high in the trees that are thought to have covered much of Africa at the time. We only need to look at newborn human babies to see some remnants of that tree-dwelling past.

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    Place a finger under a baby's toes and they will instinctively curl their tiny digits around it to get a grip. In the trees, infant primates cling to their mothers and to branches from birth. If they do not, they will fall and perish. Our ancestors went through several fundamental anatomical modifications to shift from four legs to two. The pelvis changed from being tall and flat from front to back to being much shorter and more bowl-shaped, giving better leverage for the muscles that move the hip in upright walking.

    The angle of the thigh bone changed to point inwards, bringing our feet more directly under the centre of our bodies. Our spines also curved, forming a distinct S-shape and helping to bring our body weight over the hips and to cushion the brain while walking. Eventually our lower limbs also grew longer, allowing us to take larger, more efficient steps.

    Our feet changed, too. Apes have long, opposable big toes to grab branches. Human toes are shorter and they line up with one another to create a lever to push off at the end of a step. The long-standing and dominant theory suggests climate change was a key driver of the process.

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    Several million years ago, Africa began to lose some of its forests as vast grasslands grew, so our ancestors gradually left their ancestral forests and moved out onto the savannahs. Bipedalism made more sense in an environment where trees were rare. Standing up allows you to see over long grass to scan for predators and prey.

    The ancestral humans who were best at standing would have been more likely to survive and pass on their genes, so it is easy to imagine how natural selection could have resulted in a gradual shift from simply standing up briefly to permanently moving around in an upright posture. The climate in Africa did not dry out enough to create savannahs until long after Sahelanthropus and Orrorin had evolved. The fossil record suggests the shift to walking on two legs might have occurred relatively early in our evolution. For instance, fragments of a fossilised skull were discovered in Chad, west central Africa in and The ape-like creature the skull belonged to is now called Sahelanthropus tchadensis , and it lived between seven and six million years ago.

    The base of the skull shows that the neck was tucked directly below the head in a vertical position, like ours are, whereas chimpanzees tend to hold their neck horizontally. This suggests, according to its discoverers, that Sahelanthropus may have walked upright on two legs.

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    6. And if Sahelanthropus did not, another ancient ape alive six million years ago probably did. This animal, Orrorin tugenensis , appears to have had a thigh bone very similar in shape to a modern human one , suggesting it walked upright. And the personal pronoun here can change. She can be on her last legs. And he can be on his last legs. If something you own is old and not working, you can say it is on its last legs.

      The real reasons why we walk on two legs, and not four

      For example, I have owned my car for 15 years, and it is on its last legs. Everything is breaking. A company that is losing money and soon to be out-of-business can be said to be on its last legs. This show has been going strong for several decades! So, please listen, Like, Share and Comment to make sure this show has legs to stand on in the years to come! ZZ Top is the rock band singing about legs at the end of the show.

      Pambazuka: Ideas have legs | Abahlali baseMjondolo

      Do you have any expressions using "legs" in your language? Do you tell actors to "break a leg" before heading on stage? Let us know in the Comments Section.

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      Show comments. Search Search. Audio menu. Learning English Broadcast. Previous Next. Words and Their Stories. Does This Story Have Legs? April 16, See comments Print.