Do you know the guide I am referring to?
Where you there?
Do you know every guide in ever museum in the world?
Do you know any of the kids or parents that were there?
If not, I do think you are making a lot of assumptions, but them again, assuming that all started with nothing and that nothing became a frog and over millions and millions of years that frog became your great, great, granddaddy 2 zillions times removed (a monkey), makes me think that you can assume just about anything and given enough time you can convince yourself that it is true, that it is a fact, even science.