It's official! Mt Everest is 8848m tall... or is it?

Controversy reigns over the height of the world's tallest mountain! News comes today that Nepal and China have finally agreed that the sensible way to measure Mt Everest/Chomolungma/Qomolangma/Sagarmatha is to the top of the rock, rather than the top of the snow, and that they have settled on the height determined by an Indian survey in 1955, 8,848m. However, the National Geographic Society disagrees; in their expedition of May 1999, the height was surveyed using GPS to be 8,850m. That's apparently 2m of uplift in 44 years, 45mm/yr! At that rate it's probably 8,850.5m by now...