Mr Gates suggested that new techniques to identify senders, or the imposition of a small fee to send e-mails, might solve the problem.

ECONOMIST: Unwanted e-mails are no longer the menace they once were

In 2004, Bill Gates claimed that it would take two years to solve the problem of spam e-mail.

FORBES: Magazine Article

Before libraries and publishers can come together and agree how to solve the problem of library e-book lending, they probably will have to understand each other.

FORBES: What Is Going On With Library E-Book Lending?

The agency shop was devised to solve the free rider problem, i.e.

FORBES: Why Milton Friedman Opposed Right-To-Work

Scientists have successfully developed a computer out of E. coli bacteria ( again), which has managed to solve the Burnt Pancake Problem -- at least in a limited form.

ENGADGET: Bacteria computer is good at math, even those pesky story problems