How do we know about several men's 'memories' - left in writ? Because we can refer to them whenever we like (should we choose to, which you obviously don't), and can even trace them back to studies and experiments of their predecessors (acts and facts, not 'memories'). I really can't believe that some today are in such a state of denial that they think that they can convince others to question the validity - even ~purpose~ - of science.
I can agree though that, for us 'layman folk', we have to have a certain degree of 'faith' when reading the conclusions of others (especially if we don't have time (or resources) to empirically recreate their experiments ourselves); but what would you rather have faith in: an organisation (network) whose pay-to-pray doctrine leads to no conclusive results, or a relatively transparent organisation (network) whose works have (consistently and continuously) resulted in the technology we are using today?