Map created by the CDC As a parent of 3 young kids few maps have resonated as much as the map above showing where people are getting less than 7 hours sleep a night, the amount the Center for Disease Control (CDC) considers enough. The map itself was from 2014, but I’ve managed ...
Lead-acid is the oldest rechargeable battery in existence and was invented by the French physician Gaston Planté in 1859.2 One hundred and fifty years later, it is still popularly used in cars, wheelchairs, scooters, electric bikes, golf carts, and UPS systems. The lead-acid battery must b...