Back in grad school I had a well-respected tenured prof point out that Wikipedia was great for looking up immutable and uncontroversial technical things (e.g.,

Back in grad school I had a well-respected tenured prof point out that Wikipedia was great for looking up immutable and uncontroversial technical things (e.g., a list of refractive indices) and could even be good as a starting point for learning about a topic to research it. You just can't stop there.