- No. 649: Gertrude Elion
- No. 648: Two Visions of
Aviation
- No. 647: Foreign Literature
- No. 646: Difference Engine, No.
2
- No. 645: Sarton and Sense
- No. 644: Gas Odorizer
- No. 643: Hall Jackson,
Physician
- No. 642: Tyndall and Germs
- No. 641: Junkyard
- No. 640: Tin in Turkey
- No. 639: Christmas Eve, 1991
- No. 638: Bush-bushnell
- No. 637: Leonardo, Anatomist
- No. 636: Gertrude Stein and
Gears
- No. 635: An Old Iron Furnace
- No. 634: Influence
- No. 633: The Gentleman's
Magazine
- No. 632: Niemecz' Barrel
Organs
- No. 631: Old Knowledge
- No. 630: John Joseph Merlin
- No. 629: Gregor
Mendel
- No. 628: Printed
Music
- No. 627: The Duchess &
Greenwich
- No. 626: Maria Montessori
- No. 625: The Crossbow
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- No. 624: Tyndall, Science &
Religion
- No. 623: Drilling for Heat
- No. 622: Ignaz Philipp
Semmelweis
- No. 621: Dee, Jones, and
Magic
- No. 620: Phillis Wheatley
- No. 619: Pit Viper
- No. 618: Black Salt
- No. 617: Darwin and Racism
- No. 616: 19th C.
Transportation
- No. 615: Learning to Fly
- No. 614: Robert Fludd
- No. 613: William Gilbert
- No. 612: Godly Play
- No. 611: Drunk on Ink
- No. 610: Paracelsus and
Oporinus
- No. 609: The Mother of
Invention
- No. 608: Collodion
- No. 607: A Windmill in Kent
- No. 606: Newton and the
Apple
- No. 605: Alfred Nobel
- No. 604: Chemical Chirality
- No. 603: Pare's Monsters
- No. 602: Blue Planet
- No. 601: Heatley & Penicillin
- No. 600: Walking the Bayou
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