20 rivers sustaining over 2.5 billion people are in serious trouble. Dam construction, pollution, over-extraction, and climate change are killing critical freshwater systems. Data-driven breakdown by region.
The universe is staggeringly vast. Stars account for 98% of matter in a galaxy, and there are trillions of them out there. This introduction covers star types, stellar evolution, galaxies, and the basic structure of our cosmos. If you’re starting your journey into astronomy, this is your foundation.
Not all pollution glows in the dark, but radioactive pollution is uniquely dangerous. It contaminates land, water, and air with unstable atoms that emit harmful radiation for decades or centuries. I explain what radioactive pollution actually is, where it comes from, its effects on human health and ecosystems, and what we can do to prevent it.
Carl Scheele tasted hydrogen cyanide and survived. Marie Curie’s notebooks are still radioactive, stored in lead-lined boxes. Karen Wetterhahn died from a few drops of dimethylmercury through her gloves. Here are 5 chemists who paid the ultimate price for science.