Has a Chinese-born professor discovered a big piece to a 150-year-old maths puzzle?

The usually solitary, hermetic world of mathematics has begun to buzz – thanks to an unassuming Chinese-born mathematician with a reputation for solving the unsolvable.

Sixty-seven-year-old Yitang Zhang may have taken a key step towards understanding the most important unsolved problem in mathematics, a problem that has vexed academics for more than a century.