"Did anybody see any living dinosaurs? No? Then how can we know anything about them?" we practically know NOTHING about them Do you know whether the T Rex was really a carnivorous animal, or did he use his razor sharp teeth to eat huge fruits and nuts. btw, his teeth are still rasor sharp, even after millions of years "Did anybody witness continental drift directly? No? Then how do we know it happens?" yes, continental drift is measured directly there is no relevance with this "Has anybody ever seen a lithium atom? No? Then how do we know lithium exists?" you can witness millions of lithium atom if you want to, so yes, it is save to say lithium or at least that "stuff" exists "Has anybody ever been inside the sun? No? Then how can we say what processes happen there? " these are just theories based on assumptions and observation "Something to think about." You didn't answer the question. there has never been the confirmation of the two-way approach which relativity takes for granted, or was there? fossils have nothing to do with this Please Register or Log in to view the hidden image!