But about the harder sciences: when this ball got rolling, I attended a lecture of a statistician, who explained that basically all genetic results preceding were likely wrong, unless they showed something like 6 sigma significance. That's because H0 is so easy to reject when you base H0 and H1 on different measurements. The result is that every theory is true.

It would be great if human beings were more amenable to rigorous experiment. Failing that, we at least need to understand what these things do and don't actually mean. It's either that or give up trying to study people entirely.