In another year dominated by COVID-19, we all need a little weird medical science to lift our spirits, and 2021 did not disappoint. As many of us know, people are strange, and there is no end to the oddities to be found in the human world - and here are four of the best from 2021 - from a man injecting himself with magic mushrooms which then grew in his blood, teens “catching” Tourette's-like symptoms from social media videos, an unfortunate Indian woman cried tears of blood during her period, and an Aboriginal memory trick that beats Sherlock Holmes' “mind palace”.