Explain SMBC — the wiki for Saturday Morning Breakfast Cereal

This comic poses the question: "What if scientists had the same standards as pundits?" A person asks a scientist how he knows the Earth is a cube, and the scientist replies, "Well, I thought it once, then I thought it again. That's two data points right there."

The joke satirizes the extremely low evidentiary standards of political pundits and TV commentators, who routinely present personal opinions or anecdotal impressions as if they were meaningful data. By transplanting this reasoning into a scientific context -- where evidence must be rigorous, reproducible, and peer-reviewed -- the absurdity becomes obvious. Thinking the same wrong thing twice does not constitute two data points, but this kind of circular self-confirmation is standard practice in punditry, where repeating an assertion is treated as strengthening it.