September 14, 2011 6:20 am A Special Bond Teacher donates kidney to save coworker she once shared classroom with. US & World Videos 2:42 Mother, surrogate celebrate a perfect ending to their long journey 1:12 Watch: Why vaccines are contributing to improved public health 1:53 The Helix School in San Rafael growing with the community 3:33 Bay Area sees slight improvement in air quality, annual report shows 1:29 Cyclists from Spain take on Death Valley Ride to Cure ALS