Imagine an alien species that studies humans and a researcher discovers that some humans are wearing chainmail armor to battles. The researcher hypothesizes that wearing armor improves humans' odds in said battles. Of course this calls for a n=5000 study on human gladiator battles where some participants are provided chainmail armor and others are not. Ahh, science. Meanwhile, all the humans are like: uhh, yeah, 5000 of us died for this Sherlock?