Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.

MoneyWeek's experts tell us what they would go for if they could pick only one stock, sector or market for the next quarter-century. Tips range from defence and agriculture to Vietnam and Jardine Math ...

The straight-line depreciation method allocates an equal amount of depreciation expense to each period of the asset's useful ...

Check Your Work: After adjusting the coefficients, recount the number of atoms of each element on both sides of the equation.