This week we see how nature can sometimes be the best classroom. Philippe heads to Key Largo to join a high school class getting up close with local seagrass habitats. Then we head to the streams of Pennsylvania to go on a "Bio-Blitz" surveying aquatic insects. From there it's up to the Pacific Northwest to see how volunteers use camera traps to keep tabs on elusive animals. And finally in Los Angeles we join the Natural History Museum for an urban citizen science project.