Beyond oil, the Middle East conflict is fuelling fears of a shortage of helium – a by-product of liquefied natural gas (LNG) production that is critical for semiconductors, aerospace applications and high-end medical equipment. The medical sector is on alert, as magnetic resonance imaging machines depend on liquid helium to cool their superconducting magnets, and a supply crunch could jeopardise diagnostic services. A warning from Marc Johnson, a virologist and professor at the University of...