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Mystery Object #7
Atmos Clock: a Self-Winding Wonder
SHORT: D-Day 'Cricket'
The Marx Dial Typewriter (and the Trouble with Patents)
Metascope Type B: the Dawn of Night Vision
Channel Announcements: Sponsorships, I'm Hiring, and Q&A Contest!
Carbide Lamps: the Caver's Friend
WWI Engineers' Instruments: the Stories Objects Tell
A CANDU Attitude
Simplex Typewriters: From Bargain Tool to Children's Toy
The Cloud Chamber: Revealing a Hidden World
Pythagorean Cup: the 2,500-Year-Old Practical Joke
WWII Aircraft Recognition Training: Watching the Unfriendly Skies
Beeman's Gum: the Gum of Pilots
Homemade Hybrid Rocket Test #3: Explosion
SHORT: Aldis Signal Lamp
The Talking Viewmaster: Now With Sound!
ALSEP: Apollo's Unsung Experiments
"Evidence in Camera" and the Art of Aerial Photo Interpretation
Reflector Gunsights: the Fighter Pilot's Friend