3 points
I think the argument here is that you are going to have to draw the line somewhere. Instead of replicating every experiment yourself, you’re just going to have to take someone’s word for it.
You may trust a particular scientist, publication, journal, school book or another source. You may believe that what they say is reliable and… well true? Or maybe you believe it’s close enough, or at least it’s the best info we have at the moment, but who knows if it’s actually true or not. Either way, people choose to believe something about these sources, because you have to draw the line somewhere.
