Heavy books are proliferating—but they may be health hazards. The world’s largest Medieval manuscript features a full-page picture of the Devil. Japan's mundane costume festival. Boston Dynamics’ robot dog now talks using ChatGPT. Understanding how trees communicate. The blackest known black paint. On-demand toaster printing. JR’s Appliance Museum features more than 10,000 rare electrical appliances. White Castle and Chipotle are adding food-prep robots. A jacket made of spoons. The James Webb Space Telescope cracks open the Crab Nebula. Tabasco and Banza have collaborated on a pizza that gets hotter the more you eat it. All that and more in WhatTheyThink’s weekly miscellany.