If only even a single human cell was even close to as simple as a nuclear reactor. Physics students with merely 2 or 3 years experience can talk about such things with reasonable authority. A doctor with a decade of study is still a newbie.
As it is it's like trying to decompile a 6Gb self modifying probabilistic program with no documentation and no debugger, running on self modifying hardware designed by the self modifying program itself.
That they've been able to figure out anything concrete at all is remarkable. That every nutter with a random idea feels they have equal standing to people who've worked in the field for one or more decades is going to piss people off.
For example, what would be inappropriately off topic to post to LessWrong discussion about?
I couldn't find an answer in the FAQ. (Perhaps it'd be worth adding one.) The closest I could find was this:
However "rationality" can be interpreted broadly enough that rational discussion of anything would count, and my experience reading LW is compatible with this interpretation being applied by posters. Indeed my experience seems to suggest that practically everything is on topic; political discussion of certain sorts is frowned upon, but not due to being off topic. People often post about things far removed from the topics of interest. And some of these topics are very broad: it seems that a lot of material about self-improvement is acceptable, for instance.