is that with ar you are augmenting your reality, the world you are already in, whereas with vr you in a sense leave this reality and go into another, virtual world. augmented is probably more the way we will go in future as it's much more interactive and you're not restricted by the headset and headphones...
virtual classes: test the programs and software you'll be using ahead of time so you don't miss an online class, sanghera says. stay focused. when you are online listening to your professor, don't open other programs—it can be distracting, she says. find a quiet place where you can focus, and use headphones...
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