[HangnJudge]

how can observing it
(under the assumption it means with your eyes)
change it's state???

To observe the particle with your eyes requires
bouncing a photon against the particle
that then interacts with you eye.
By bouncing a photon or other particle against it,
the state of the particle is changed.

Some interaction with the particle must occur
before you can perceive it.

[Chode]

bouncing a photon or other particle against it, the state of the particle is changed.

but aren't photons bouncing off of it anyway whether they go into my eye or not?

i guess my point is, i am not doing anything but looking at it,not trying to measure it - not affecting it in any way, scattered photons of light either enter my eye or they don't through nothing of my doing, if they enter my eye and i see them, how does that change it's state?

that is why i ask is he using the words measure and observe interchangeably