Could one of the world’s oldest medical textbooks hold the secret to destroying today’s antibiotic-resistant superbugs? A new study suggests it’s possible, reports the BBC . After perusing remedies in a 9th- or 10th-century manuscript known as Bald’s Leechbook in the British Library, researchers from Nottingham University whipped up an old eye salve and tested it on methicillin-resistant staphylococcus aureus, or MRSA.