They found two districts with practically zero cancer. Oddly enough they were both industrial areas at a time when there were very few environmentalists, especially in the Russian dictatorship where tens of millions were being killed or starved to death because Stalin was a monster of the first order.
Anyway, back to the story. Stalin sent two teams of investigators, one to each district to see if they could discern the reason why no one was getting cancer in the two areas.
One of the investigators was interviewing a woman in her home. She offered him a carbonated beverage made from black tea, sugar and a 'mushroom' that wasn't really a mushroom.
The investigator was not familiar with the effervescent brew. She told him, "Everybody here drinks this kvas. Even the drunks drink it, and they stay out of fights."
The investigator reported his findings, and sure enough, the other team of investigators found out that everyone in the other district also drank the drink that tastes a little bit like champagne or apple cider.
Since then the drink has spread all the way to the US where it can be found in health food stores. For those who like to brew things, kombucha can be made at home for mere pennies per drink. Premade, bottled kombucha comes in many different flavors and costs over $4 a bottle.
Many regular drinkers claim kombucha has a plethora of healing properties, including changing gray hair back to its natural color. Maybe someone here could make a kombucha beer.
Pray for me.