Fossil discovery may give new start date to life on Earth
Researchers must now prove that the fossils, found in Canada, are biological in origin
Extra-terrestrials ‘likely to have existed’ but gone extinct
Life probably developed elsewhere but disappeared due to planetary instability, scientists say
Birds do it, bees do it – but how did T Rex do it?
Stop sniggering down the back: the delicate question of how dinosaurs had sex remains a mystery
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