The Download: faking blood and the future of batteries

Plus: The FBI has arrested an OpenAI engineer accused of snooping. The US military's race to make fake blood In February 2007, a US military helicopter carrying blood to a field hospital was shot down in Iraq, killing all seven crew members. The mission was a reminder of the risks of transporting blood, which has a limited shelf life and is often in short supply. Now, a $73 million DARPA effort aims to create shelf-stable versions of plasma, platelets, and red blood cells. The idea is to develop dried blood products that can be stored for long periods and deployed quickly on the battlefield. The project aims to have bags of dried blood products deployed in the field by 2029.