Why Do Your Pupils Get Larger When You're On Drugs?

Normally, our pupils dilate in response to changing light; as it gets darker, our pupils get larger. But they expand in size for other reasons as well, including when we're sexually aroused and when we're performing complex cognitive tasks. But it's also known that certain medications — including illicit drugs — can… » 9/29/14 11:20am 9/29/14 11:20am

110 Years Ago, These Microscopic Photos Horrified Londoners

In 1904, the micrographs Arthur E. Smith, were exhibited at the Royal Society's Annual Conversazione in London, are showing many viewers the world under a microscope for the first time. And some reacted to these giant images of insects, plants, and human body parts with not just wonder, but revulsion as well. » 9/23/14 3:00pm 9/23/14 3:00pm

Have Humans Already Conquered The Threat Of Extinction?

The Great Filter theory suggests that all advanced civilizations eventually destroy themselves before acquiring the capacity to colonize space — a notion that could explain why we've never been visited by aliens. But there may be another reason for the celestial silence. Yes, the Great Filter exists, but we've… » 9/01/14 11:00am 9/01/14 11:00am

A Marine Biologist Explains Godzilla's Exponential Growth

In 1954, Godzilla was 164 feet tall. With each successive appearance over the past 60 years, his height has increased, so that he now stands at 492 feet. Not bad, given that it took cetaceans 55 million years to go from 8.2 feet to 98 feet in length. Can evolutionary theory help explain Godzilla's rapid growth spurts? » 5/05/14 8:40am 5/05/14 8:40am

8 Great Philosophical Questions That We'll Never Solve

Philosophy goes where hard science can't, or won't. Philosophers have a license to speculate about everything from metaphysics to morality, and this means they can shed light on some of the basic questions of existence. The bad news? These are questions that may always lay just beyond the limits of our comprehension. » 5/02/14 10:00am 5/02/14 10:00am