Female brain triumphs

Tom,Dick and Harry were competing to cross a wide river in full flow,

Each one was given a wish before having a go.

Tom wished for big arms and legs of steel,

He swam across in an hour,no big deal.

Dick wished for a power boat to whisk him there,

It took him 30 minutes,this wasn't fair.

Harry wished he was a female with a clever brain,

Walked across the bridge in 5 minutes,then changed his name to Jayne.