This is one part of the distinction. Work usually involves locking oneself up on a sterile, isolating work environment. This is good for the menial parts of sci

This is one part of the distinction. Work usually involves locking oneself up on a sterile, isolating work environment. This is good for the menial parts of scientific work. But there is a creative side to science. This is the seemingly lazy part where you need relax and let your mind wander. If you enjoy the problem you are trying to solve, your thoughts just naturally revolve around it even when you are not technically at work. And it is a different, probably less structured process from focussing on a certain path to a solution. And that is why it is so important.