I enjoy looking through the Wonderopolis archives (categorized on the side of the site). I especially like seeing what the Wonderopolis Wonder of the Day from exactly one year ago on that day. I normally share that on twitter and have started sharing that recently some on facebook.
I normally look in the holiday category for the one that is the closest to the current date last year. Once I get to that Wonder, I use the arrows to move forward or back to find the date I want.
The Wonder of the Day from last year on Jan. 10th was dealt with inventions:
There are 2 types of patents. A design patent is easier to get but much tougher to defend. It is based on a design, look, and aesthetics. A utility patent is how something works or is used. It is a better patent to get and can be easier to defend. Patents can last for 20 years at most. Any patent older that 20 years can be used by the public.