LifeTwitter shows language evolves in cities Charting new words in tweets shows they originate in cities with large African American populations before spreading to areas with similar demographics ¿ìè¶ÌÊÓÆµ
HumansOliver Sacks: I want to de-stigmatise hallucinations The neurologist who wrote The Man Who Mistook his Wife for a Hat lifts the lid on hallucinations – including his chat with a spider Opinion