Why a healthy lifestyle could save your sanity

We know that adopting a healthy lifestyle, like not smoking, exercising regularly, and keeping our weight down, yields long term benefits. But a recently concluded 35-year study is showing just how extensive these health benefits can be — and not just to our bodies, but our minds as well. » 12/11/13 12:00pm 12/11/13 12:00pm

Can humanity survive a population of over 10 billion people?

By the end of this year, the human population is expected to reach seven billion people, just twelve years after we hit the six billion milestone. But how much more crowded is our planet going to get? Will we keep on expanding indefinitely, or are we approaching the upper limit? The current consensus is that we'll… » 2/20/11 1:20pm 2/20/11 1:20pm