The bite of a Brazilian wandering spider might not kill you, but it can make you wish you were dead. The cocktail of toxins in its venom produces a suite of not-so-delightful effects like swelling, intense pain, paralysis, and if you’re male, a painful erection that lasts for hours.
Ever heard a voice inside your head or saw something that wasn’t there? You’re not alone — and it doesn’t necessarily mean there’s something wrong with you. A study of more than 30,000 people from 18 countries found that about one in 20 of us have experienced a psychotic episode at least once.
The United States prides itself on being a country of animal lovers. But when it comes to the ethical treatment of lab animals, few countries perform worse. Here's how the U.S. practices measure up to the rest of the world. [UPDATE: io9 has editorial concerns with this article.]