Star dunes - sometimes called pyramid dunes - stand out among sand dunes for their towering height and eye-catching form.

"Nature-based solutions have been shown to be holistic and sustainable, and they work. Sand dunes will help to mitigate the ...

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 ...