A few weeks ago, I was wondering around my school when I realized that at absolute zero, Heisenburg's Uncertainty Principal may break down due to the non-existance of energy among subatomic particles. Later, while I was researching the topic, I found a few books that covered this topic and interpreted this as the evidence that absolute zero can not be reached since under no circumstances should HUP break down. However, an article published by the NewScientist magazine stated that "Even if the universe itself froze over and its temperature plunged to absolute zero, zero-point vibrations would still be going strong, propelled by energy from empty space." Which contradicts my previous statements. So, can anyone tell me which statement is more accurate. If neither statements are at all accurate, can someone provide me with a more accurate picture regarding this topic?