That task is more complicated than it used to be, and it's not because cooking is an intellectually demanding task.

WSJ: Best of the Web Today: The Other Obesity Problem

"This would have been a most demanding task for security forces anywhere in the world, and we should acknowledge the resolve shown by the Algerians in undertaking it, " Cameron said.

CNN: STORY HIGHLIGHTS

"This would have been a most-demanding task for security forces anywhere in the world, and we should acknowledge the resolve shown by the Algerians in undertaking it, " the British leader said.

CNN: STORY HIGHLIGHTS

Just as fever (which is also controlled by cytokines) creates an environment hostile to the reproduction of bacteria and viruses, so lethargy conserves energy that can be directed to building up the immune system an extremely demanding task.

ECONOMIST: Fatigue: Killing time | The