I've got a very weak signal <a href=" http://www.crosscarefoodbank.ie/index.php/an-essay-about-sport ">essay on my role in protecting the environment</a> Scientists at Imperial College London used the pandemic in 2009 as a &ldquo;unique&rdquo; natural experiment to work out why some people went down with a nasty bout of the flu while others didn&rsquo;t.