Twenty years ago, the paranoia that consumed cults like Heaven's Gate existed on the margins of American society. Now it's moved toward the center of the nation's political life.
Churchill allowed science to flourish. Without a similar attitude in today’s politics, we may hit a bottleneck for life that leaves a Universe without a single human soul to enjoy it.
Millions of people claim to have had encounters with aliens, but most can be explained by psychology rather than UFOs.
Whether it's Hillary Clinton's courting the UFO vote or Donald Trump's lending credibility to various conspiracy theories, the "triumph of reason" seems to have gone by the wayside.
It's easy to attribute the wrong cause to a mysterious phenomenon. But science has some tools to help you avoid these attribution errors.
Was it a UFO? Was it a high-tech plane? Here's what lucky people really saw over Scotland on February 29.