More than 150 years after acid rain was first identified, scientists now see success in recovery from its damaging effects
Paleontologists are looking to the fossil record to decipher what the earth's atmosphere was like hundreds of millions of years ago
On December 6, 1916, two years into "the war to end all wars," a German naval crew destroyed a set of 75-million-year-old dinosaur skeletons
Page 348 of 439