- No. 249: Amy Johnson
- No. 248: Golden Gate Bridge
- No. 247: Piaget and Mechanism
- No. 246: Weirs in Turriano's
Codex
- No. 245: Deslandes' Glass
- No. 244: Cable Car
- No. 243: Babbage's Engine
- No. 242: Chinese Bombard
- No. 241: Giordano Bruno
- No. 240: Math Is Too Hard
- No. 239: Xerox
- No. 238: Momsen's Lung
- No. 237: Submarine
- No. 236: Norbert Rillieux
- No. 235: Harrison's Timepiece
- No. 234: A Lady in a Parachute
- No. 233: Balsa Wood
- No. 232: Ritual Origins
- No. 231: The Real Mccoy
- No. 230: The Round Earth
- No. 229b: Track Widths
(Revised)
- No. 228: Stone Quarries
- No. 227: Women in Mathematics
- No. 226: Emmy Noether
- No. 225: Sonya Kovalevsky
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- No. 224: Mary Fairfax Somerville
- No. 223: Sophie Germain
- No. 222: Crystal Balls
- No. 221: Caroline Herschel
- No. 220: Quebec Bridge Failure
- No. 219: Emilie De Breteuil
- No. 218: The Flight of Voyager
- No. 217: The Witch of Agnesi
- No. 216: The Aging of Books
- No. 215: Hypatia's Mathematics
- No. 214: Grapes
- No. 213: The Pythagoreans
- No. 212: Early Photography
- No. 211: Anesthetics
- No. 210: Maxim's Airplane
- No. 209: Joseph Priestley
- No. 208: Upper Paleolithic Tech.
- No. 207: Selden's
Automobile
- No. 206: Astronomy
- No. 205: The Centennial Exhibition
- No. 204: Millikan
- No. 203: Encyclopaedia Britannica
- No. 202: English Inventions:
1901-05
- No. 201: Rush to Build
Steamboats
- No. 200: An Old Machinists
Handbook
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