Comment by nonameiguess

This feels like a basic critical thinking/epistemology thing that you (hopefully) pick up at some point in life, usually from experience finding reliable, canonical primary sources for data. You can't do that for everything. Being wrong about trivial factoids isn't the end of the world. You should, however, at least be capable of doing further investigation, realizing that Major League Eating has its own website, and that there is no event in South Dakota sanctioned by them. If you look at actual results, or even just think for a few seconds, you'd also realize that 7.5 hot dogs in 10 minutes is bush-league level nonsense that would not win a local church contest, let alone an international championship. That may not be obvious to all users of the Internet, but it would be if you've ever watched a real contests, looked at the results for a real contest, or try yourself to eat a high volume of hot dogs rapidly. You only need to do it once in your life and a basic smell alarm should go off in your head forever if someone puts out a claim that is very far from something you know to be true.

This is what human reasoning is and we're supposed to be good at it. At its best, this is what any reasonable education should do for you if you take it at all seriously, arming you with some capacity for doing prima facie sanity checks of poorly sourced claims.