Original subtitles

Brian Cox without hesitation repetition

or deviation can you please explain for

us as succinctly as

possible I have a timer here the rules

of quantum mechanics your time starts

now well the most basic version I know

of is is Fan's version which uh

essentially says particles are particles

and they hop from place to place with a

particular probability and the

probability that a particle that's at

some place will be at some different

place later is given by a very simple

rule um it uses a quantity called the

action which is to do with the mass of

the particle and the time and the

distance uh and you so you basically

calculate these little uh quantities

which to do with something called the

action and you add them up so if I if I

start with an electron in one corner of

the room and I say what's the

probability at sometime later it'll be

somewhere else then at every point in

the room you can assign a probability

that it will be there at a later point

with one simp Rule and that's it now

this is called a path integral

formulation of quantum mechanics that

underlies everything else you can you

can get the rest from there so it's a

simple rule says what's the probability

of particle move from A to B that's it

I'll I'll stop the timer then very good

well under a

minute