Yes, that is a strange omission. My first VR experience was using his equipment at a VR conference in the 90's, playing a virtual tennis game. It was cool as hell, but during a 'racket' swing, I accidentally smacked an observer that got too close. I still like to think it was one of the first "VR accidents."
The issue is most likely that high radiation levels are inhibiting the growth of microorganisms. So new microorganisms would probably just die.
Note that this is not particularly unexpected. We do this on purpose (in a more controlled manner) to prevent spoilage of food and reduce food borne illnesses.
"To confirm their hunch, they created around 600 small mesh bags and stuffed them each with leaves, collected at an uncontaminated site..."
They used uncontaminated samples yet the environment killed the microorganisms and fungi they brought in. I think this doesn't work as long as the radiation level stays this high in the area.
That will be happening every time it rains, wind blows, river flows, something like an animal comes in etc. Repopulating it probably isn't hard and wouldn't take long as it's happening naturally. The tricky part is trying not to have every organism killed after arriving.
7, among the highest for my cohort. Although it's possible the sorting heuristic I used helped, basically a loose binary sort followed by closer inspection and comparison of proximate squares. Increased the zoom level of the page to get a bigger sampling area for my eyes.
Succeed or not in their stated goal, it could end up throwing off a lot of interesting science, assuming actual bio/neuro/genetic science is backed by the venture. Presumably all this enhanced by vast amounts of computational prowess, as well.
That said, there are a lot of questions about what the philosophical, cultural, sociological and political underpinnings and implications might be. Creating a friendly environment for discussing those could be a worthwhile exercise as well. For example, what is the interaction between individual wellbeing and longevity, and the quality of world in which you live? Perhaps it's a two-way street, a wholistic set of factors that includes social wellbeing in addition to medical health, taking for example the case of that Greek island with famously long-living people (Ikaria).
As someone said, it's not the years in your life, it's the life in your years.