Did you know scientists identify more than 13 billion species of organisms, and they discover more almost every day? An interesting presentation demonstrates how scientists keep track of so many species. It also shows how they...

Fans of Sherlock Holmes may be surprised to learn that in addition to stories of the famous deductionist, Sir Arthur Conan Doyle is also the creator of Professor Challenger. An irascible, unpredictable scientist, Challenger was featured...