A former Navy pilot has opened up about an otherworldly experience he says he experienced in 2004.

It was a sign of things to come. About 2.3 billion years ago, our primitive planet was an oxygen-poor world profoundly different from now - but then it briefly and mysteriously gained an oxygen-rich atmosphere. This so-called Lomagundi Event could have provided a fleeting opportunity for complex, animal-like creatures to evolve billions of years before the ancestors of all animals we know today appeared.

Andrew Greenstein, an app developer from San Francisco, started journaling a few months ago. He tries to write for five minutes every day, but it's challenging to set aside the time. Still, he's read that journaling reduces stress and can help with goal-setting, so he's trying to make it a habit.

Deep, dreamless sleep is often described as unconsciousness: We don't see distinct objects or have linear and memorable trains of thought, as we do in daily life or while dreaming. But in a meta-analysis published last month in Trends in Cognitive Sciences, cognitive science experts argue that there is no clear line of consciousness between dreaming and deep...

I'd been back from studying abroad in Mexico City for a couple of days when I asked my dad, "Can I use the lavadora?" "The what?" He didn't speak Spanish. I knew that, of course. I didn't even really speak Spanish.