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According to a research, human chins did not develop because of mechanical forces like chewing, but an evolutionary adaptation related to face size and shape led to its development. This evolutionary adaptation is probably associated with changes in hormone levels as humans became more social.

According to Nathan Holton who studies craniofacial features and mechanics at University of Iowa, primates or the Neanderthals did not have chins and one way or another, it seems unimportant but the reason behind it is quite interesting.

Duke University physicists have developed techniques to determine what happens below the ground when missile strikes the earth.

When a missile hits the ground, the destruction above ground is obvious. However, what happens beneath the surface is still unknown.

The new technique enabled the researches to simulate high-speed impacts in artificial soil and sand in the lab. They were the able to watch what happened underground close-up, in slow motion. In order to capture the impact, they used a close up camera.

The findings revealed that the soil gets harder when struck harder, indicating that a hard hitting missile cannot penetrate the underground part of the soil.

A study published in the journal Current Biology has shed light on as to why sea turtles are mostly observed as adults or hatchlings and their disappear when they are young turtles.

The research has shed light on the period of their disappearance. The researchers from the National Oceanic and Atmospheric Administration and the University of Central Florida conducted an experiment in which they placed trackers on toddler turtles after they were caught in wild.

The researchers tracked 44 turtles for around two to three months. They were able to have a slight idea of what turtles are up to. The researchers then used modeled conditions in ocean currents and also employed carefully designed buoy drifter for comparison.

Authorities said that a 15-year-old girl with autism has been found in Culver City, within a few miles of where she was last seen three weeks ago. Investigation is still going on to find out if she was the victim of a crime.

According to Los Angeles police, Lt. John Jenal, Kimberly Greenberg was found on Monday and is now reunited with her mother.

Police have said that an unspecified number of people have been detained in connection with the girl's disappearance. Jenal said that the people who have been detained are not related to the girl.

Jenal said, "We are trying to recreate the last three weeks. Obviously, given her situation we may require some time. We have detained some people. We want to make sure she is not a victim".

On Tuesday, an Oklahoma volunteer sheriff's deputy was booked into the county jail as he fatally shot a suspect after he got confused in his stun gun and handgun, according to authorities.

Robert Bates capitulated at the Tulsa County jail. He was released after posting $25,000 bond. According to Bates' attorney, Clark Brewster, his client would not give any statement. According to Brewster, an initial court appearance will be made by Bates next Tuesday.

A video captured by an astronaut wearing a GoPro camera during spacewalking around International Space Station has been released by National Aeronautics and Space Administration (NASA).

In the footage that has been recently released, Earth slowly rotates below the space station while astronauts install antennae, and work on the robotic arm. The astronaut who wore the camera is Terry Virts.

In two videos, some of the work they done can be seen. The researchers are curious about a few things like what's the source of the sound in the videos? According to NASA's spacewalk teams, it is believed that it's the sound of the spacesuit's fan, that circulates air and also drives the water pump and water separator.