- No. 399: Early Metal
- No. 398: Taming the Beast
- No. 397: Maria Merian
- No. 396: Bread, Wine, and
Beer
- No. 395: John Herschel
- No. 394: Prometheus' Fire
- No. 393: Electrictiy
- No. 392: Margaret Cavendish
- No. 391: Lulu-belle
- No. 390: Writing
- No. 389: Coba
- No. 388: Moving Icebergs
- No. 387: James Nasmyth
- No. 386: Cooperation
- No. 385: African Steel Making
- No. 384: Samuel Slater
- No. 383: Wooden Clocks
- No. 382: Frankenstein's
Grandmother
- No. 381: Civil War Submarine
- No. 380: Equal Temperament
- No. 379: Hutton's Cyclic Universe
- No. 378: Women in the Academy
- No. 377: Wheelbarrow
- No. 376: The Leaning Tower of Pisa
- No. 375: Small
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- No. 374: Prison Treadmills
- No. 373: The Airplane as a Bird
- No. 372: A Viet Nam Memorial
- No. 371: Martin Luther King
- No. 370: Moving an Obelisk
- No. 369: Civil War Ironclads
- No. 368: The Size of it
- No. 367: A Minoan Wreck
- No. 366: Christopher Robin
- No. 365: Measuring America
- No. 364: Trembley's Polyps
- No. 363: Sub-ocean Maps
- No. 362: Body Temperature
- No. 361: Water Witching
- No. 360: Bar Code
- No. 359: Dolni Vestonice Ceramics
- No. 358: Giovanni Battista
Morgagni
- No. 357: 2nd Anniversary
- No. 356: Priority
- No. 355: Neolithic Technology
- No. 354: Deep Time
- No. 353: The Fresno Scraper
- No. 352: 15th Century Pump
- No. 351: Antarctica
- No. 350: Boyle's Lab Assistants
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