Black hole toilet / Needling the patient / Gangue in goaf / Plank on wood

This week’s Feedback column (that I write) in New Scientist magazine has three segments. Here are bits of each of them: Black hole bum— Roger Sharp adds another item to Feedback’s compendium of black holes that are findable on surface maps of our own planet (7 October). Visitors to the Maitai Esplanade Reserve in Nelson, New Zealand, may find relief […]

Infrastructure and appearances: “made almost entirely of wood”

“[The] Germans themselves made extensive use of decoys to protect airfields and other targets. One example in the Netherlands was constructed with particular care, made almost entirely of wood and including hangars, gun positions, aircraft and vehicles. However, it took so long to build that Allied photo interpreters had plenty of time to observe it. […]