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You have full access to this article via your institution. Hello Nature readers, would you like to get this Briefing in your inbox free every day? Sign up here . Casey Harrell using the brain-computer interface at his home. Credit: Regents of the University of California, Davis A man with paralysis uses a brain implant to help him to communicate and use his computer at home. The brain–computer interface (BCI) translates the neural activity of 48-year-old Casey Harrell, who was diagnosed with a type of motor neuron disease six years ago, into text that appears on a computer screen and enables him to operate a computer, send text messages and e-mails and continue his job working in climate advocacy. It is “nothing short of revolutionary”, says Harrell. Nature | 5 min read Reference: Nature Medicine paper The latest generation of obesity drugs might increase testosterone levels and improve the quality of sperm in men, according to a systematic review. Researchers identified five randomized controlled trials of GLP-1 medications that included measurements of testosterone levels. The results of two of these showed that testosterone levels rose in those taking GLP-1 drugs, and one trial also showed an increase in sperm quality . More robust trials are needed to confirm the association, says endocrinologist and review co-author Pratibha Natesh. But emerging evidence from other sources points in the same direction. …