The extraction process to remove the lead from the sulfur is very simple, thus lead has been extracted from Galena since the earliest times.Galena from certain regions is rich in silver, and some specimens may contain as much as 20 percent silver. Because of this, silver-rich Galena is also an ore of silver.
Research shows that hiking has a positive impact on combating the symptoms of stress and anxiety, says Gregory A. Miller, PhD, president of the American Hiking Society. Being in nature is ingrained in our DNA, and we sometimes forget that.
Time to hike: Living on a higher altitude could help prevent overweight people from becoming obese, a U.S. study has found. The group of American researchers looked at nearly 100,000 U.S. Army or Air force servicemen and women, with at least two years of service, from January 2006 to December.