Scientists have found stone tools dating back 3.3 million years, long before the advent of modern humans, and by far the oldest such artifacts yet discovered.

The tools, whose makers may or may not have been some sort of human ancestor, push the known date of such tools back by 700,000 years and may challenge the notion that our own most direct ancestors were the first to create new technology.

The discovery is the first evidence that an even earlier group of proto-humans may have had the thinking abilities needed to figure out how to make sharp-edged tools. The stone tools mark "a new beginning to the known archaeological record," say the authors of a new paper about the discovery. 

Researchers have confirmed strong warming in the upper troposphere, known colloquially as the tropospheric hotspot, long expected as part of the global warming hypothesis. 

Though the tropospheric hotspot appears in many global climate models, the inability to detect it has been used to suggest climate change is not occurring as a result of increasing carbon dioxide emissions. 

If you think of your 'sense of self', do you locate it in your heart or your brain? 

It can tell people a lot about your decision-making process. Obviously, advertising is one area.  Messages targeted at people with independent self-construals (your head tells you buying this car is the right decision because it has good value) will work better for those people than messages targeted at people with interdependent self-construals (Your heart tells you buying this car is the right decision because it has the highest safety ratings for families.) 

Our belief in evil influences our feelings about capital punishment, according to Donald Saucier, associate professor of psychology at Kansas State University and Russell Webster at St. Mary's College of Maryland.

They drew their conclusion after about 200 participants were given a summary of a case in which a murderer confessed to his crime. They then asked each participant about his or her support for different types of sentences, such as jail time with community service, jail time with the opportunity for parole, jail time without the possibility for parole and other options.

Our solar system started as a disk of microscopic dust, gas, and ice around the young Sun and the amazing diversity of planets, moons, asteroids, and comets came from this primitive dust. 

NASA's Stardust mission has returned to Earth with samples of comet Wild 2, a comet that originated outside the orbit of Neptune and was subsequently kicked closer to Earth's orbit in 1974 when Jupiter's gravity altered Wild 2's orbit. 

Many of us are familiar with electrolytic splitting of water from their school days: if you hold two electrodes into an aqueous electrolyte and apply a sufficient voltage, gas bubbles of hydrogen and oxygen are formed. If this voltage is generated by sunlight in a solar cell, then you could store solar energy by generating hydrogen gas.This is because hydrogen is a versatile medium of storing and using "chemical energy".