I guess the best way to discover new and interesting things, is just keep your eyes open, and by that I mean is, pay more attention to your surroundings. Isn’t it fascinating that when we are on vacation and on a sightseeing tour, we take in all of the “new” and beautiful scenery and relics. I suppose it could be argued that we just don’t have time to go on expeditions on our home “turf” because of time constraints. In reality, it really doesn’t take very much time to discover new things, about 90 seconds is all it requires to examine the details on a leaf in your back yard.
I believe that each person has something that they have an abundance of interest in, so there will always be something to desire more knowledge about; or at least, to just satisfy one’s own curiosity.