Test for Radon

If you are buying a home or selling your home, have it tested for radon.
https://www.minnpost.com/second-opinion/2017/01/radon-health-hazard-40-minnesota-homes-few-test-it-say-health-officials?utm_content=buffer9c127&utm_medium=social&utm_source=facebook.com&utm_campaign=buffer

EPA Home Buyer's and Seller's Guide to Radon

https://www.epa.gov/sites/production/files/2015-05/documents/hmbuygud.pdf