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What is rest mass energy?How could we access this energy?

You gave an example in the lecture “length contraction” that in case of a train moving through a tunnel the height
of both the train and the tunnel will remain fixed otherwise the train can’t pass through the tunnel.Isn’t it a same kind of paradox like this?(i.e. both the train and tunnels perspective are equally correct?)

Up to this lecture I understand that there is no universal notion of space and time,everything is relative!!!
But what next? What will happen if we know these facts?I mean what is the physical implication of this thing?

Did you want to say that the increase in the ” space interval ” of that object which is moving is being converted into the decrease in the ” time elapsed “(dilated
time)for that object ?

Did you want to say that the increase in the ” space interval ” of that object which is moving is being converted into the decrease in the ” time elapsed “(dilated
time)for that object ?

No, I am not totally convinced by this relativistic reasoning of past and future being real just like present.How can we see future of something which hadn’t happened before?Is that mean the future is deterministic rather than probabilistic?