Reality... what's that?!

It's Halloween in the year 1984. Richard and Peter are both dressed in Guy Fawkes costumes and are standing on either side of the street. Richard has an egg in his hand. It appears to be that of an East African ostrich (struthio camelus molybdophanes). Richard hurls the egg towards Peter and naturally, Peter attempts to dodge it. Just before impact however, the world ends and everything spontaneously vapourises.
Richard knew that in fact the egg was merely a very good replica and is actually made of foam. Had Peter known this, he would have not tried to avoid the egg (as his only reason for doing so was to prevent him being covered in egg yolk).

There are two realities that despite being contradictory, co-exist at the same time:
1. Richard's reality where the egg is made of foam
2. Peter's reality where he is about to be covered in yolk (egg not made of foam)
Which is the "real" reality?
Bear in mind that a) the egg vapourises before impact and so you can't adopt a "wait and see" tactic and b) despite rumours, it is impossible to pause time and examine the egg yourself.

This may seem like a trivial example but I believe it has bearing on many other aspects of life - the most obvious of which being history. Again, contrary to poular opinion, it is (without a shadow of dout) impossible to travel backwards in time and witness events for yourself. And even if this were possible, your take on the situation would almost certainly be biased due to a) your beliefs about the situation prior to travelling backwards in time or b) your lack of understanding of the situation (given you weren't born and raised in that time period etc.). What I have (hopefully) outlined above is the importance of a neutral objective reality which is clearly not attainable in disciplines such as history which by definition ("his story") is the view of the world by one man. Everyone's take on events are different (and perhaps even contradictory) and so there is no single unifying history as such.

What I really mean to say is that I don't see the point in learning history anymore as at best, we are are memorising one man's interpretation on events of the past. As for reality, I don't even know where to begin... (if indeed it exists at all!).

... It's times like these that I'm glad I did maths :-)