Mrs. Linda Gale Lectures on Health, Healthy Foods, Quantum Physics, and the Great Northern Lights. She's incredible and she should run for some type of Senate Seat. Encredible understanding of how the brain works.
Sherlock Head Canon - I'd like to believe Mrs. Hudson being a busy body decided to mess with Sherlock and take care of him. He'd never admit to wanting it let alone needing it so instead he dealt with her husband. If the American and choosing to fake his death is any example I doubt there are limits to how far he'd go for her. He adopted her as his Mum. <3