Interesting Things Powered by Linux

TiVo (and a gazillion other TV set-top boxes)
Airline entertainment screens
Gas Station self-pay terminals
Google's self-driving cars
San Francisco's traffic control system
TrackingPoint 338TTP rifle aiming system (https://www.youtube.com/watch?v=Pmteh_NChOQ)
SETI (the Search for Extra-Terrestrial Intelligence) systems
Watson (the super-computer that won Jeopardy: https://www.youtube.com/watch?v=WFR3lOm_xhE)
The threat-detection system on Lockheed Martin nuclear submarines
The International Space Station
The Large Hadron Collider (LHC)
Tesla Model S (https://www.teslamotors.com/models)
Mavizen TTX02 Motorcycle
Delaval automated cow milker (https://www.youtube.com/watch?v=Aju_wqHhCBk)
Underwater tsunami sensors
Computer Engineer Barbie (http://www.amazon.com/Barbie-Can-Computer-Engineer-Doll/dp/B0042ESG9W)
Countless “Internet of Things” (IoT) devices
Too many things to list …