This story appears in the November 2012 issue of National Geographic magazine. I got my first lesson in the physics of sand dunes in 1998 on an expedition into the Sahara. In order to take aerial ...

on the northern side of the Great Sand Dunes National Park. When Walker did not make it back to camp the night of Oct. 30 and was not at camp the morning of Oct. 31, the hunting party triggered ...

Scottish Green party co-convener Patrick Harvie ... listed as one of the finest examples of a "dynamic" mobile sand dune system in the UK. Before the course was built, the dune system moved ...