The mashable post is light on details; here's the phys.org article they're referencing: http://phys.org/news/2012-10-physics-duo-tractor-dual-bessel.html http:

The mashable post is light on details; here's the phys.org article they're referencing: http://phys.org/news/2012-10-physics-duo-tractor-dual-bessel.html http://phys.org/news/2012-10-physics-duo-tractor-dual-bessel...