Audi claims the A8 Hybrid will be able to run at speeds up to 62 mph solely on electric power, and will produce zero local emissions at a constant speed of 37 mph.

FORBES: Sneak Preview: Audi A8 Hybrid

General Electric would be nowhere in quality control if not for quick and constant measurement of output.

FORBES: Instant feedback in the classroom

Substantially more complex than previous aircraft, the new plane required the pilot to attend to the four engines, a retractable landing gear, new wing flaps, electric trim tabs that needed adjustment to maintain control at different airspeeds, and constant-speed propellers whose pitch had to be regulated with hydraulic controls, among other features.

NEWYORKER: The Checklist

At a constant 20 mph, the ActiveHybrid 3 will go 2.5 miles on electric power alone.

FORBES: BMW ActiveHybrid 3 Review: A Lot Of Fun On Slightly Less Fuel

Providing a constant light during daylight hours the bottle bulbs are promoted as a better choice than candles and electric lighting that may have dangerous or faulty wiring and could cause fires.

CNN: Plastic bottles light up lives