Nitrogen trichloride makes swimming pools smell and is a good indicator of plenty of pee.
An explosive was recently made by accident in a UK lab, but many labs across the world make them for interest and application.
More than 50 tons of TNT produced a blast that was heard on the Norfolk coast.
Critics claim that Russia and Syria are targeting civilians with thermobaric 'vacuum' bombs.
What are the implications of North Korea's claims to have detonated a thermonuclear weapon?