Excerpt: Parasites are common in vegetarians because their eggs are commonly found in vegetables or fruit. Mars has dust storms as violent as hurricanes and snowstorms at its North Pole. There are about 52 species of hummingbirds in Costa Rica. Thread worms and hook worms can pass through unbroken skin -... Continue Reading Did You Know? - July 2009 from Dr. Hull's free monthly ezine, The Healthy Newsletter.