Are tornadoes in the US getting worse?
They are largely unpredictable and unforeseeable but are twisters becoming a more serious threat?
Category Archives: Science
Powerful artificial-intelligence ban possible, government adviser warns
Systems above a certain power may need be stopped, a member of the government's AI Council says.
Aras Amiri highlights jailed Iran environmentalists’ plight
A former prisoner held for years in the same jail as the group tells the BBC of their plight.