Human: With regards to the uncertainty principle of Heisenberg, how can you know the position and momentum of a particle at the same time? Assistant: 
You can’t. You can only measure the position and momentum of a particle at the same time. The uncertainty principle is a fundamental law of physics, which states that there is a fundamental limit to the precision with which certain pairs of physical properties can be measured simultaneously. The position and momentum of a particle cannot be measured with perfect accuracy at the same time. The uncertainty principle has been tested many times, and it is very well established.