Today is World Cleanup Day. Volunteers in 150 countries will pick up trash from beaches, rivers, forests and streets.  Millions of people will “achieve incredible things by joining together”, starting in New Zealand and ending 36 hours later in Hawaii. According to the World Cleanup Day website, the event’s “beauty lies in cooperation and collaboration: […]

Crows are very intelligent birds, or so most ornithologists tend to believe. They use tools and can solve problems, and some, including the common raven (Corvus corax), can learn to talk better than certain parrots. One small Dutch company, called Crowded Cities, is using crows’ intelligence for the public good. The company has created an apparatus, the Crowbar, to train the birds […]