Scientists discover a surprising clue to autism's origins hidden in the placenta

It might seem like a good idea, but it could just complicate things for your doctor. The post Do you need a preventative rabies vaccine? Probably not. appeared first on Popular Science.

A surprising new discovery suggests that fear may cause the brain to blur the line between danger and safety rather than distinguish them more clearly. By observing brain activity in mice using augmented reality, scientists found that memories of threatening and harmless environments began to overlap, potentially allowing faster responses to danger. This "better safe than sorry" survival mechanism could help explain why people with anxiety or PTSD sometimes experience intense fear in completely

NASA's Artemis IV moon mission will be a complicated affair — especially if SpaceX's Starship ends up being the lunar lander. The massive spacecraft will need an unknown number of refuel flights in two separate orbits.

A nearly 50-year-old mystery involving disappearing frogs in Brazil may finally be solved, with scientists uncovering evidence that a deadly fungus swept through the region and devastated vulnerable species. Remarkably, many frog populations have since rebounded, suggesting they developed greater tolerance to the disease that once threatened their survival.