Stonehenge is interesting, though any mystical (or downright alien) symbolism is lost when you visit much larger sites, like Avebury Henge, that are clearly not mystical at all. Because of its fame, people have long sought answers as to why Stonehenge was built.

A group of archaeologists now contend it was indeed symbolic - but not religious symbolism, it was more political.

NASA's Voyager 1, launched in 1977, was propelled into deep space with the help of Jupiter's and Saturn's gravity. Now it is about to leave the solar system. But exactly when is unclear.

Voyager 1 is traveling at a speed of about 3.6 Astronomical Units (AU) per year - one 'AU' equals the distance between the Sun and the Earth, or 93 million miles.

A new review of studies suggests that fructose may not be as bad for us as previously thought - it may even provide some benefit. 

Fructose, which is naturally found in fruit, vegetables and honey, is a simple sugar that together with glucose forms sucrose, the basis of table sugar. It is also found in high-fructose corn syrup, the most common sweetener in commercially prepared foods.

A report from market research agency Conquest into the social media habits of 14-24 year olds claims that Facebook's core audience - teenagers - are starting to fall out of love with the website and that activity may have peaked amid a groundswell of dissatisfaction and concerns over privacy and even bullying. 

20 years ago in America, members of Congress, armed with studies showing that a college degree meant more lifetime earnings on average than a high school diploma, decided the way to boost income for everyone was to make sure everyone got a college degree.

What changed?  Very little.  The best and richest students still go to the top universities while everyone else does not; but student loan debt has climbed as universities, able to charge unlimited amounts, did just that and hired more people and built more buildings.

Tapping ocean energy sources like tides and offshore wind sound fine to people who understand nothing about science (the Anything But Oil contingent) but in reality it requires pile driving, the practice of pounding long, hollow steel pipes called piles into the ocean floor to support energy turbines and other structures. 

Pile driving creates loud, underwater booms that can harm fish and other marine animals so if you're thinking CO2 is better for the world, you are right.