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 memristor design uses built-in oxygen gradient to bring stability to reinforcement learning Rivalry and collaboration attitudes: Study finds writers need both to thrive in the age of AI Waste water to clean energy: Japanese engineers harness the power of osmosis Microsoft to invest $10 bn for Japan AI data centers New research could empower people without AI expertise to help create trustworthy AI applications UV glow test measures air disinfection performance in minutes