Mouse embryos grown without eggs or sperm: why, and what’s next? (Nature) Could tiny blood clots cause long COVID’s puzzling symptoms? (Nature) Psychedelic drugs take on depression (Nature) How scientists are shifting their search for links between diet and dementia (Science News) Five reasons why you don’t need to panic about coronavirus variants (MIT Technology Review) Some vaccinated people are still getting covid. Here’s why you shouldn’t worry. (MIT Technology Review) Should the US start prioritizing first vaccine doses to beat the variants? (MIT Technology Review) Had Covid? You May Need Only One Dose of Vaccine, Study Suggests (The New York Times) How gut microbes could drive brain disorders (Nature) How anti-ageing drugs could boost COVID vaccines in older people (Nature) Why mixing vaccines could help boost immunity. (MIT Technology Review) Pfizer wants to give you a booster shot—but experts say it’s too soon (MIT Technology Review) Here’s what we know about kids and long covid (MIT Technology Review) Mixing and matching different vaccines seems to work (MIT Technology Review)