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We have virus checkers that can recognize viruses , even mutating ones , and remove them . The highest-scoring countries tend to score uniformly high in different components , while low-scoring countries have component scores that are unevenly distributed . FDA officials later revealed that 6 percent of canned light tuna sampled between 2001 and 2005 had mercury levels that exceeded the average in canned albacore tuna , which the federal government tells pregnant women and young children to limit eating because it tends to have high levels of mercury . Many schools have study halls that are specifically designed to allow students to study or get homework done . The Witch hazel , among others , has seed pods that will contract as they dry , ejecting their contents like " bullets " over surprising distances .