Trail Maintenance
Khan Academy is a great place to go to strengthen up your previous learning or to challenge yourself with some new learning (It is free and fun!)
Here are some websites to check out if you are needing to strengthen those neural pathways with some brain stimulation.
Want to learn some cool stuff? Check this out.
Want to impress you friends/family with a cool trick like fitting a round peg into a square hole? Check this video out!