"""<span class=""""caption"""">Lichen are natural air pollution monitors that children can measure to keep track of their local environment.</span> <span class=""""attribution""""><a class=""""link rapid-noclick-resp"""" href=""""https://www.shutterstock.com/image-photo/lichen-on-tree-180800033?src=D7HxxKH8srJG14cJbgbv0Q-1-12"""" rel=""""nofollow noopener"""" target=""""_blank"""" data-ylk=""""slk:Dark Moon Pictures/Shutterstock"""">Dark Moon Pictures/Shutterstock</a></span>"""
{}