TED Talks
Ted: Ted Ed: Which Came First: The Chicken or the Egg?
It's a question that has perplexed everyone from the ancient Greeks to modern scholars. Which came first, the chicken or the egg? Take a crack at this curious conundrum. [3:31]
Utah State Office of Education
Utah State Office of Education: Identifying and Classifying Minerals
This thorough Utah State Office of Education site explains the criteria for identifying minerals and provides pictures of various minerals.