Scientific evidence indicates that time can travel more slowly in one of three situations:
i) lectures, particularly early morning and late evening.
ii) first kisses
iii) imminent death
Deciding which of these three situations pertain when you feel time travelling slowly can be difficuly. Scenarios (i) and (iii) can be particularly difficult to distinguish.
As for time travel. Theoretically it is possible both forwards and backwards. One can imagine impossible-causal-chains, but these would simply not arise, they are impossible! For example, one can wonder about the chain of events "what if I went back and killed my younger self", but the chain of events "I killed my younger self" would never arise. Some seemingly bizarre things may occur to prevent this happening, but that does not entail logical inconsistency.
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I've been 4thTimeLucky, you've been great. Goodnight and God bless!
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