Last updateFri, 16 Feb 2018 7pm

Popular, eco-friendly gadgets rely on human kinetic energy

If you’ve ever wanted to tone your calves and vasti mediali (that round muscle just above the knee) while grinding corn, charging your phone or making a smoothie, then a small gang of clean energy inventor-entrepreneurs operating out of a two-story house in the northwest of Guadalajara is the answer to your overly-specific prayers.