greenberg
And you have unwavering confidence in the of
1. the people who processed particular artifacts and put them in a particular context
2. the principle of inference
The qualification and truthfulness of the various scientists involved has been proven sufficiently over time that I do have reasonable confidence in their findings. Also there is this process called peer review and verification which has proven very effective at refining our understanding and ferreting out those who are lacking.
If you are into absolute "certainty" you will find me absolutely frustrating because I've neither need nor desire for such nonsense. Reasonable certainty is just fine when coupled with reasonable verification and error correction processes.