say instead think reality ultimately temporal 's like okay mean like would change think many things approach many problems 'm going need lot right know know sagan sort invoked people get wrong trying invoke extraordinary claims requiring extraordinary evidence 's trying say 's balancing process okay yeah saying sagan terms claim people invoke claim 's 's claim comes formal logic mathematics carl sagan made claim extraordinary claims require extraordinary evidence means 'm going 'm going pause something tremendous elegance 's extraordinary 's going cause reformulate solve many problems think many domains 'm going need n't need quantity 'm going need lot convergent evidence make construct 'm using trustworthy 's saying logically epistemically socially 's making claim 'm making claim 'm making claim epistemically 's claim uh 's basically cognitive claim uh think elegance risk-taking 're elegance 're committing limited attentional cognitive resources right framing world 'm going relevance realization 're committing 're caring world particular way means 're taking great 's risk 's always risk 're commit forward want seen milgram puts way forward commitments backward commitments 'm risking forward right want trustworthy thing mitigate risk yeah