Necessity...

Yes, it really is the mother of invention. I'm sure I saw this on Pinterest, and it has been a lifesaver this year. There are three doors coming into my room. (Three!) Each of those doors is a "Columbine" door, meaning they are made of cement, can't be propped, and should remain locked most of the time for student safety. This little trick means that the students can enter the room, but we can also be on lockdown really quickly. (Well, as fast as I can sprint to three doors to remove them!)

Swim noodles. They aren't just for swimming anymore.