[erosenbe0]

Odds are not that low. In the 55 years since opening this high school would have had at least 20,000 unique people associated with it.

Expected number of cancer cases would probably be several thousand.

Claims of primary brain cancer derived from social media are probably not too accurate. A proper study is going to discard most as being confused with other cancers. So now you aren't looking at an unimaginable rate.