China's president greeted the Monday arrival of the Olympic flame in Beijing, at the start of what looks certain to be its most controversial journey ever. The risk of the torch relay being ambushed by demonstrators along its 130-day route through 21 cities on five continents has grown since Beijing's clampdown on violent protests in Tibet.

It wouldn't have been a Chinese state occasion without a secret and a rumor. The secret was why the timing of the welcoming ceremony was changed, and the rumor was that it must be for security reasons. China's Olympic organizers say otherwise. They pointed to the early arrival of the plane carrying the torch from Greece, and Beijing's weather forecast portending fog later in the day. While it's certainly true that the ceremony went off smoothly in brilliant sunshine, and the sky clouded later, the whole episode left me wondering.