As to the extent of intentional manipulation in the timeline, it's hard to say.
There is much speculation.
But it still supports the multiple timeline theory.
Remember that time and space are bound in our material realm.
So whether accidental via research or intentional via direction manipulation, the theories posit that the science alone (via CERN etc) could cause a collapse of the entire universe.
That is, if quantum tunneling effects attach to the Higgs Boson "God Particle", the chain reaction could destroy the entire universe instantly...and the theory is that we fall into the closest alternate timeline at hand, one that will be similar to but not identical to our old one. Most would never know the difference...but an increasing number do see the gaps. Hence the Mandela effects.
I will add though that since the quantum realm is also the realm of consciousness, we can and do insulate ourselves from the mad brainwashing that would occur when we are moved without our knowledge...and we do so by being present in the moment, by reflection and by conscious centreing.
Here's the joke.....
http://www.theonion.com/article/cern...arallel--55780
But here's the reality...which is that we just don't know about the quantum effects, despite how it's played down here, LOL...
http://www.popularmechanics.com/scie...erse-17192502/
Peace & blessings
7L
__________________
Bound by conventions, people tend to reach for what is easy.
Here we must be unafraid of what is difficult.
For all living beings in nature must unfold in their particular way
and become themselves despite all opposition.
-- Rainer Maria Rilke