Sometimes schools can be guilty of having a variety of different hardware and software and this doesn't make for an effortless teaching environment. (qaeducation.co.uk)
You also have a variety of options for location doing it this way too. (biggerpockets.com)
In the wild, your dog would not be eating the same thing every day, so why should your modern dog not have some variety in their diet at home? (mydoglikes.com)