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.
Humble Media Genius Episode 22 | 3m 17s | CC
Ruff and Lupine use artificial intelligence to help write a poem celebrating the greatest media expert of the 21st century: Ruff Ruffman!