What is unique about dry Ice compared to regular ice?
The freezing point to make dry ice
is higher than that to make
regular
Dry ice sublimates and skips the
liquid phase change
Dry ice is super cooled water and
regular ice cools at a slower
temperature
Regular ice can keep perishables
cooler longer

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.