What is a dimension? In 2D... and 1D

1D - it’s the new 3D! Tweet it - Facebook it - minutephysics is now on Google - And facebook - Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute! In this episode we talk about dimensions and how we know that we live in 3D (or do we?). Music by Nathaniel Schroeder youtube: myspace: Created by Henry Reich