Paul Steinhardt

“I know of no other scientist, no other theoretical physicist alive who has a clearer focus on whether our theories and ideas are relevant to the real world. And that's always what he's after.”

“{{cite journal|title=Impossible Matter! Stuff that shouldn't exist in nature...but does! Paul Steinhardt|date=June 2, 2022|journal=Dr Brian Keating, YouTube|url=https://www.youtube.com/watch?v=2zgSX39Fxd4&t=1987s}} (quote at 33:07 of 49:06)”

“String theory suggested that we should have a whole new set of particles called "supersymmetric partners" that were supposed to be observed at the Large Hadron Collider at CERN — we don't see those.”