Category Science

Why Are Recurring Dreams Usually Nightmares?

January 14, 2025 4 min read Why Are Recurring Dreams Usually Bad Ones? Recurring dreams may feature taking a test the dreamer didn’t study for, having to make a speech or being attacked. Here’s why our sleeping brain comes back…

GPS Is Vulnerable to Attack. Magnetic Navigation Can Help

Far above your head, constellations of satellites are working constantly to provide the positioning, navigation, and timing systems that quietly run modern life. Known as the global navigation satellite system, or GNSS, signals from these satellites provide the foundation for…