TechnologyMetallic hydrogen would be the ultimate fuel - if we can make it The universe’s most common element could also be its most wondrous. Two different groups of researchers say they've made it - but can either claim withstand scrutiny? Features
EnvironmentTackling emissions from heavy industry is key to fixing climate change Ramping up renewable energy, electrifying transport and ending energy waste is the easy stuff, the hard problem of climate change is reducing emissions from steel and concrete production Leader