Explora Advanced Search
I recommend using Advanced Search in Explora. It allows you to narrow your search in productive ways. Look for a box on the Advanced Search page that displays Lexile Reading Levels. Choosing an appropriate grade level will weed out college-level texts in your search results.
Another way to assure appropriate reading levels would be to type in the name of a magazine and chose Publication Name from the drop-down menu.
Some great magazines to use in your search include Faces, Dig Into History, Calliope, Cobblestone, Zoobooks, Time for Kids, Scholastic News, Discover, Smithsonian, Muse, and National Geographic Kids. Experiment with other magazines that your teacher suggests.
When the search results come up, you can use the slider in the left-hand column to narrow the range of publication dates, if you wish.