Electromagnetism is one of the four fundamental forces of nature. Learn about the relationship between electricity and magnetism, the different wavelengths on the electromagnetic spectrum, and how an invisible force protects our entire planet.
Everest, the world’s highest mountain, has been an elite climbing destination for decades. But rising tourism in the Sagarmatha National Park, has made trash and plastics management a challenge.
In Porto Velho, capital of a Brazilian state ravaged によって 最近 fires, residents are on edge and falling ill from the pervasive smoke. A hymn describes the city's sky as forever blue, but now it's grey with smoke.
