Related on MNN: Visit our wilderness and resources category.
Video: Smoky Mountain Park turns 75
America's busiest national park hits a big birthday milestone.
Subscribe to our newsletter
Iowa boy builds tiny house in his backyard
How were the Great Pyramid's massive blocks moved into place?
Parallel worlds exist and interact with our world, say physicists
Why do men tell women to smile?
Farmers' Almanac warns of brutal winter
Iceberg more than 4 times the size of Manhattan breaks away from Antarctica