• Arts
• Business
• Computers
• Games
• Health
• Home
• Kids and Teens
• News
• Recreation
• Reference
• Regional
• Science
• Shopping
• Society
• Sports

History

• 61
• Christiaan Huygens
• A biography and short summary of his work.

• 62
• MacTutor: Christiaan Huygens
• Includes a full biography, several images, and some scientific works.

• 63
• Wikipedia: Christiaan Huygens
• Offers an overview of the life and works of this Dutch mathematician, astronomer and physicist.

• 64
• Johannes Kepler
• A short biography.

• 65
• Johannes Kepler and the Music of the Spheres
• An article by David Plant describing Kepler's astrological beliefs.

• 66
• More Kepler, by Michael Fowler
• Part two of a biography, discussing Kepler's investigations of planetary motion and gravity.

• 67
• Starry Messenger: Johannes Kepler
• Biography, and information on Kepler's mathematical techniques, poetry, and interest in astrology. From the Whipple Museum of the History of Science.

• 68
• Catalog of the Scientific Community: Roemer, Ole Christensen
• Background data on the scientist.

• 69
• Wikipedia: Ole Rømer
• Short crosslinked encyclopedic article.

• 70
• Carl Sagan Memorial Book
• Includes contributions from around the world (hosted by the Federation of American Scientists).

• 71
• Even in Death, Carl Sagan's Influence Is Still Cosmic
• Discusses Sagan's influence on space exploration, especially at NASA. Article by William J. Broad for the New York Times. (November 30, 1998)

• 72
• The Darkened Cosmos: A Tribute to Carl Sagan
• Article from the Skeptical Enquirer describing Sagan's major achievements, with tributes from his friends and colleagues. (March 10, 1997)