The G7 group of industrial nations calls on Russia to stop moves to "annex" Crimea, as Ukraine warns of a Russian military build-up at the border.
Malaysia says the last message from a Malaysia Airlines plane suggests everything was normal on board before it vanished over the South China Sea.
Could the answer to future electricity demand be right under our noses? Jonathan Kalan looks at the new research behind urine-generated power.
A new study judges virtuous destinations on their track record with human rights and wildlife protection to encourage travellers to spend their money wisely.
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