French police have said that video footage of the Paris attacks reveals the presence of a ninth, previously unnoticed, jihadi, who could still be at large.
It didn't take a genius to realise the criminal possibilities and suddenly a previously unnoticed area of internet development was given some much-needed attention.
Nemesis is a neighbouring (double) star, previously unnoticed but heading towards the solar system, like the goddess of divine retribution she is.
For the authorities in Saudi Arabia, though, this was cause for alarm rather than celebration, alerting them to a previously unnoticed peril in their midst.
He's inspiring people to examine previously unnoticed details (good!) but also convincing some that secrets lurk in the pattern of their upholstery (not so good).
Where it identifies previously unnoticed suffering, such as that experienced by the unemployed, happiness measurement makes a valuable contribution to public debate.
A vine has invaded Shaun Tan's house in suburban Melbourne, Australia, through a previously unnoticed gap where the window of his studio doesn't quite meet the sill.
If I've just woken up, the hair on my head sticks out in all directions (it never used to), and I see newly sprouting hairs in my nose and ears, and previously unnoticed moles.
While the Archer has not located Mr. Fossett, it has been instrumental in the discovery of at least eight previously unnoticed plane wrecks in the rugged Sierra Nevada region.
Others, like Wayne Mueller, an aquatic plant management specialist for the Minnesota Department of Natural Resources, said that so many more people lived around lakes these days that floating islands previously unnoticed were being spotted.
And, with the clarity of perfect hindsight, if past experience is any guide, previously unnoticed clues will be found that if detected earlier might have led to a more timely identification and arrest.
