Tim Clark also shone for the visitors with an emphatic eight-birdie 4 and 3 win over Zach Johnson.

CNN: Woods routs Yang to clinch Presidents Cup

Concerns about national security have been a factor in the 20-month delay in holding Williams' inquest, and an agency more used to working in the shadows has had an uncomfortably bright light shone into its practices.

CNN: STORY HIGHLIGHTS

The element to be purified is first incorporated into a chemical that can be turned into a gas. (In this case, the exact compound is still proprietary information.) Then an infra-red laser is shone through the gas.

ECONOMIST: Diamonds

That means a constant spotlight is being shone on the firm's policies, with parents and regulators increasingly worried about an environment where young people now spend so much time.

BBC: Facebook grows up