If you judge a fish by its ability to climb a tree ....

There is no end to learning. Every day provides a new opportunity to learn something new, an opportunity to do something different, an opportunity to upgrade your mindset, an opportunity to refresh your thinking, an opportunity to use the unused part of your brain. Yes! Believe it or not, no matter how much you feel like your brain/mind/head is full, you can never use up your brain completely.