Amazon is raising free-shipping minimums for some customers who don’t have Prime memberships Amazon has been quietly raising the amount some customers must spend on its site to get free shipping.This article was originally published on this website. Read More New camera technology use facial cues to detect drunk drivers New method for visualization and prediction of sedimentation in soft-ground drilling Hardy transistor material could be game-changer for nuclear reactor safety monitoring No assembly required: Innovative 3D printing method streamlines multi-materials manufacturing Viewpoint: Traffic engineers build roads that invite crashes because they rely on outdated research and faulty data Formula One is moving toward hybrid engines, renewable fuel—environmental progress or just ‘greenwashing’?