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A container of goods is loaded at the port of Oakland, California. The crisis at the nuclear power station in Fukushima, Japan, has governments and transport companies worried about radioactivity. Find out what the US government said about this last week.

In 1909, Mark Twain said: "I came in with Halley's Comet in 1835. It is coming again next year, and I expect to go out with it." The author of Adventures of Huckleberry Finn died on 21 April 1910, a day after the comet's closest approach to Earth.

The Winter Olympics will officially be opened on 12 February by the governor general of Canada, Michaëlle Jean. She is a refugee from Haiti who came to Canada in 1968. The motto of the Games is "With glowing hearts/Des plus brillants exploits".

Extending north from Newcastle to the Scottish border, Northumberland's landscape is marked by romantic Norman castles, while Hadrian's Wall reminds visitors that this is frontier country. Walk the Cheviot Hills or relax in fishing villages.

A poor boy stands next to a broken bus in Chittagong, Bangladesh's main seaport and its second-largest city. Where will he go? What will he do? Has he got a chance at a better life?

Cruises are now a major part of the tourism industry, with millions of passengers each year. The industry has added ten new ships every year since 2001.