Though this sheet matched those few, there was no previous record of its existence.

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The existence of a previous acquaintance also affected behaviour: both the amount initially sent, and the percentage returned by the second player, rose in proportion to the length of time the players had known each other.

ECONOMIST: Economics focus

Previous studies have hinted at the existence of medium black holes, fingering star clusters with suspiciously large masses.

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The MP for Kirkcaldy and Cowdenbeath, who is a lifelong Raith fan, believes it lifts away the uncertainy about the club's existence that emerged under previous owners.

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Where disclosure is appropriate, the guidance suggests that are a number of key subjects that should be provided in the disclosure, including the potential costs and consequences to the registrant of the material cyber security risks, the number and severity of previous cyber incidents, and the existence of relevant insurance coverage.

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These DNA investigations had indicated that eutherians should have been in existence much earlier than the previous oldest-known eutherian fossil - a creature called Eomaia, which lived about 125 million years ago.

BBC: Fossil redefines mammal history

What I do not detect, however, is any threat to the existence or status of the BBC - unlike previous rows which pitted governments against the Corporation.

BBC: The BBC has faced worse crises

Previous studies of wild-plant ecology have shown that the main threat to a plant's existence comes not from insect predators but from competition with other plants.

ECONOMIST: GM crop plants are less weed-like than weedy