Backyard Water Rocket With a catch & release mechanism, you can get higher pressure--with significantly higher flights! This version will be safer, especially with small kids around. (Popular Mechanics)
Vintage Handmade Wooden Scooter DIY Popular by CathodeBlue on Etsy
Use a bench vise to hold spherical stock, like bearings. This is from Popular Mechanics, but I do not read enough Spanish to track down the precise original publish date.
Watch Television For Free - DIY Digital TV Antenna - Popular Mechanics - Saving this to try later - hope it works!
Vintage Hand-made Wooden Scooter DIY Popular by CathodeBlue
Adirondack Chairs for the back yard! Painted red of course.
Popular Mechanics November 1939, via Etsy.
This Is the Coolest Cyberpunk Watch Ever - Popular Mechanics
How a circuit breaker works.
Record-Breaking Mariana Trench Dive - James Cameron's Deep Ocean Dive, Diagrammed - Popular Mechanics