Season 4
Episodes
1 Planetariums Jan 14, 2021 
2 Handheld Digital Pets Jan 28, 2021 
3 Home Gaming Console / Smartphone Springs May 15, 2021 
4 Neurosurgical Instruments / Weather Meters Jul 16, 2021 
5 Body Fat Scales / Luggage Rack Mirrors Jul 31, 2021 
6 Sushi Robots / Refractometers Oct 30, 2021 
7 Camera Phones / Electron Microscopes Nov 26, 2021 
8 Radio Controlled Watches / Encrusting Machines Dec 11, 2021