Kevin Hartnett in The Boston Globe:

The ABC conjectureis a young problem in mathematics, first proposed in 1985 by the mathematicians Joseph OesterlĂ© and David Masser to describe the relationship between three numbers: a, b, and their sum, c. The conjecture says that if those three numbers don't have any factors in common apart from 1, then the product of their distinct prime factors (when raised to a power slightly greater than one), is almost always going to be greater than c.

Have I lost you yet?