From Dawn Aerospace press release on delivering thrusters to AF: Platinum group metals are a finite resource on Earth yet are necessary in a wide range of important technologies. They’re used in medical devices such as pacemakers and are a crucial element in some cancer treatments. They’re also used as catalytic converters in cars to reduce harmful emissions by up to 90%, and they’re an essential element in hydrogen fuel cells that will help the world transition to a lower emission economy.