title: Gaia: The Practical Science of Planetary Medicine
author:  James Lovelock 
description: <br />"This is the most accessible of Lovelock's three Gaia books...Lovelock is a brilliant writer."--<em>New Scientist</em>
zlib_text: The  
  Brain’s  
  GPS
  Pathfinding  
  networks tell us 
  where we are— 
  and help to form  
  new memories
  PLANETARY SCIENCE
  Rings of a 
  Super Saturn
  MEDICINE
  On/Off Switch  
  for Genes
  ENVIRONMENT
  Can We Really 
  Capture Carbon?
  ScientificAmerican.com
  JANUARY 2016
  © 2015 Scientific American
  
  January 2016, ScientificAmerican.com 1
  January 2016
  VOLUME 314, NUMBER 1
  Photograph by Jeff Wilson
  NEUROSCIENCE
   26  Where Am I? Where  
  Am I Going?
  Scientists are figuring out how  
  the brain navigates.  By May-Britt 
  Moser and Edvard I. Moser
  PLANETARY SCIENCE
   34  Rings of a Super Saturn
  A gargantuan set of planetary 
  rings encircles a planet that orbits 
  a star 400 light-years away.   
   By Matthew Kenworthy
  PUBLIC HEALTH
   42  Death in the Water
  Arsenic contamination in India 
  and other parts of Asia is a growing 
  problem. Experts are divided about 
  how to fight it.  By Katy Daigle
  MEDICINE
   52  An On/Off Switch  
  for Genes
  Molecular switches can turn 
  transplanted genes on and off, 
  paving the way for s