Even in complete darkness, rodents discriminate objects' shapes and textures. They do this by sweeping their long facial whiskers back and forth across surfaces. For visualization purposes, the mouse shown here is in a lit environment and the first 10 seconds of the video are slowed down by a factor of 8. This video relates to a paper that appeared in the June 28, 2013, issue of Science, published by AAAS. The paper, by C.M. Constantinople and R.M. Bruno in Columbia University in New York, NY, and colleagues was titled, "Deep Cortical Layers Are Activated Directly by Thalamus."