Rocky Mountain PBS
Colorado Science: Researchers discover secret to Castle Rock's longevity
Denver Museum of Nature and Science researchers found that Castle Rock’s durability is due microscopic amounts of the colorful gemstone opal.
Season 1 Episode 3 | 54m 21s | CC
Join Greta in Switzerland and Denmark to investigate potential solutions to limit climate change. She also explores how everyone can play a role, from what we eat to what we wear. Finally, she looks for lessons from the world's response to COVID-19.