Coal dust and oil can spread toxic chemicals hundreds of kilometres out to sea. But Australia's monitoring guidelines do not meet the standards used in countries such as the United States.
Parents in three Australian states are being given misleading advice about the dangers of lead to babies and small children – including failing to warn pregnant women about miscarriage risks.
Dust from pulverised comets rather than an alien megastructure could explain odd flicker of distant star.
Cleanliness is next to godliness. Did you know hairiness is a part of the equation as well?