enigma

But by 1965 he is almost always behind sunglasses, his enigma calcified.

But now academics from the University of Southampton, working with experts across the world, say their new study may finally unravel the enigma.

Now, as a team of biologists and mathematicians, we've finally begun to unravel this great botanical enigma.'

However, there are still many enigmas about the molecular mechanisms that would explain the anomalies that make the water molecule unique.

Described by some as an “enigma”, Mrs Trump has preferred to be less public than her predecessors, giving fewer speeches both in the White House and on the campaign trail.