What happens to the human body at high heats

With a heatwave bringing temperatures in New Zealand up to 37 degrees (and up to 45 degrees in Australia), Emile Donovan chats to physiologist Grant Lynch based at the University of Sydney's Heat and Health Research Incubator. He joins Summer Weekends to share some science-backed hacks for keeping yourself cool in a heatwave, and at what point the human body starts cooking from the inside out.