In this lesson, students will investigate the nature of radioactivity and the effect of both distance and shielding materials on different radioactive sources using a Geiger-Muller tube with a counter ...

Russia's war in Ukraine has renewed fears of nuclear disaster in a world that hasn't seriously grappled with the health effects of radiation since the 2011 Fukushima crisis. Disaster could come in ...

There are hints that the universe may be behaving unexpectedly, and astrophysicists are racing to explain why. Their ideas to account for the surprising result include allowing dark matter and dark ...