The timebomb under Yellowstone
Experts warn of 90,000 immediate deaths and a 'nuclear winter' across the US if supervolcano erupts A supervolcano in the heart of America's northwest has the potential to blanket the…
What caused the mystery of the Dark Day?
Three centuries ago in parts of North America, a strange event turned morning to night. It remains wreathed in mystery - so what caused the Dark Day? Halfway through the…