<p>
	&nbsp;</p>
<p>
	<a href="http://participatoryscience.org/mercury-watersheds/essential-activity-why-do-we-care-about-mercury">Why Do We Care About Mercury?</a></p>
<p>
	<a href="http://participatoryscience.org/mercury-watersheds/optional-activity-concentrations">Mercury Concentrations</a></p>
<p>
	<a href="http://participatoryscience.org/mercury-watersheds/optional-activity-mapping-us-mercury-emissions">Mapping U.S. Mercury Emissions</a></p>
<p>
	<a href="http://participatoryscience.org/mercury-watersheds/optional-activity-road-toxicity">The Road to Toxicity</a></p>