Energy & Green Tech

New technique to turn abandoned mines into batteries

A novel technique called Underground Gravity Energy Storage turns decommissioned mines into long-term energy storage solutions, thereby supporting the sustainable energy transition.

Hi Tech & Innovation

Mazda files patent for hybrid rotary engine (Update)

Rotary engines that once powered the gorgeous Mazda RX-7 two-seater, rear-wheel drive coupe—a five-time winner of a coveted spot on Car and Driver's Ten Best autos list—were phased out by 2012. Their popularity in the ...