National Institutes of Health
National Library of Medicine: Profiles in Science: Francis Crick Papers
Biographical information about Francis Crick as well as access to an archival collection of his papers, letters, photographs, and notes, including those related to the discovery of the double helix.
PBS
Pbs: Word Problems Using Addition and Subtraction of Fractions: Harry Gets Locked Up
This video features Harry and his cousin Harley. Harley is desperate to use Harry's bike, but first he must decipher the combination to the bike lock by solving a word problem. In the accompanying classroom activity, students complete a...
Instituto Latinoamericano de la Comunicacion Educativa
Red Escolar: El Codigo De Galileo
Decipher Galileo's code and read about his biography. Instructions are also given on how to construct a magnifying glass.