US Government recommends weighing laptop before and after each visit.
Senior executives in US IT companies have been advised by the US Government to follow extremely strict policies for visits to China which extend far beyond standard software protection.
The policies encourage them to leave their standard IT equipment at home and to buy separate gear only [...]

Beijing is drawing up plans to prohibit or restrict exports of rare earth metals that are produced only in China and play a vital role in cutting edge technology, from hybrid cars and catalytic converters, to superconductors, and precision-guided weapons.
via World faces hi-tech crunch as China eyes ban on rare metal exports – Telegraph.

The longest solar eclipse of the century – The Big Picture – Boston.com.