Mr Kujau was proud of his skill and, in later life, was always happy to give a quick lesson on forgery to reporters.

ECONOMIST: Konrad Kujau

Ayrault had intended to give a lesson.

NEWYORKER: L��?tranger

O'Day attempted to give me a brief lesson on the Solowheel at Citi Field.

WSJ: Darren O'Day: Here Comes the One-Wheel Reliever

Daughter Ayesha may have to give up her bed for the night, but she usually gets a free music lesson in return.

BBC: House concerts bring magical music into front rooms

Behavioral economics has one more lesson for gift givers: If your goal is to maximize a social connection, don't give a perishable gift like flowers or chocolates.

WSJ: Dan Ariely, Author of Predictably Irrational, on Holiday Gifts