The work, described in a preprint paper, has the potential to create new treatments and accelerate research into artificially engineered cells. —Antonio RegaladoClean hydrogen is facing a big reality checkHydrogen is sometimes held up as a master key for the energy transition. The US in particular is seeing a slowdown after changes to key tax credits and cuts in support for renewable energy. Still, there are bright spots for the industry, including in China, and new markets could soon become crucial for growth. —Casey CrownhartThis article is from The Spark, MIT Technology Review’s weekly climate newsletter.