Invest in yourself, your education, your business, your ideas, your health, your happiness and wealth will follow.

He said he and his wife and father in law with health problems had been renting for 8 years and the landlord was selling the place.

Not only I don't have that kind of money (Covid ruined us), but I am also dealing with major health issues (chronic cancer) that require expenses. 

It's a great real estate + health care business combination... plus you make a huge impact on peoples lives. 

As for "why" high radon levels lead to an increased chance of cancer (especially in kids) and is likely a detriment to health for other reasons.

Back in 09  the GFC I was buying foreclosures in Fort Meyers ( lehigh Acres) FLA  basically brand new never lived in 3 and 2 1600 sq ft homes and I was paying 30 to 40k for them.. at that Time I was telling my wife that is some of the best deals in the entire world for a family to buy.US health US schools new homes all for 30 to 40k.. of course I just flipped them for 60k as soon as I could .. but you get the drift.there are still areas of the US I work were you can buy a decent home that is livable for under 50k Especially in Jills neck of the woods and a little east over into PA..

Lots of tech, finance, health setting up or expanding operations here. 

By far, your number one risk is getting sued for all that you own, due to gross neglience on your part in protecting the health and safety of your guests. 

If its a major health and or safety item with potential liability you may want to stick with a professional from start to finish.

Also, remember that foreign students have much higher and different hoops to go through from domestic - just to get a student visa, they have to show they have been accepted to the university, and full documentation to the US government that their source of funds is at a minimum enough to pay for roundtrip airfare, the out of state fees for a year, plus lodging and food/health insurance and then some.