By Vidya Rajan, Columnist, The Times This month, I highlight some of the great things that are happening in the world which science had a hand in delivering. Enjoy. Klamath dam is down and salmon swim freely upstream for the first time in 100 years.[1] The mighty Klamath river flows from the Cascade mountains along the Oregon-California and empties into the Pacific Ocean. In 1918, the first dams...