Khan Academy
Khan Academy: Energy Through Time
The quest for energy has always been a balancing act. As humans have gained greater control over their environment, they've found abundant resources - and faced numerous challenges. This article traces the history of our quest for energy.
American Museum of Natural History
American Museum of Natural History: The Horse
This resource presents illustrated essays about horses, developed in conjunction with museum-mounted exhibition, cover a wide range of topics, including the evolution of horses, the domestication of horses, the nature of horses, and the...