If we read books all the time we would be very unhealthy, as we would not get any fresh air, exercise, or contact with nature. Also we would not spend time with other people. There are a lot of plusses to reading - it's an interactive brain workout - but like everything else that's beneficial in moderation, overdoses can be dangerous.
Margaret AtwoodNobody quite knows the truth about cats purring, but it does seem to be also a self-healing thing for them, which is why, when you take your cat to the vet and it's frightened, it will purr.
Margaret Atwood