Flowing fluid counterintuitively pulls objects in rather than pushes them away. This is a really surprising phenomena especially when you demonstrate it in the right way. This is a really easy experiment you can try at home using just a ball, a string and a sink. The crazy thing is that people still argue about why this happens. Can you figure it out?

When we think "boiling", we think really hot water. But heat isn't the only thing that makes water boil. In this easy to do at home demonstration, we can see that water also boils when there is low air pressure by creating a partial vacuum using a syringe.

Here's a puzzle that gamifies addition - a fundamental skill in math. The first person to pick three numbers that add to fifteen wins. But here's a twist - you have been captured and put in prison unjustly. The cruel prison warden offers you a choice - beat him in a game of "Fifteen" and you go free, lose and you are put to death. The warden has already defeated several of your fellow inmates. Can you figure out a winning strategy and win your freedom?

Math facts aren't that much fun to learn but they're necessary to develop fluency. Here's a fun way to gamify the Multiplication Table. My daughter and I played this and she loved making the cute faces. She brought it to school and showed her teacher who asked me for the worksheet. My kid gave a presentation to her class about how to play and now it's an activity they have in rotation. I attached the worksheet as a PDF you can download and print out

Here's another matchstick puzzle... maybe use toothpicks, markers or some other objects with uniform length though. These were really popular during the 19th century, with whole books being dedicated to using them in math classes to teach. Some of them have dubious mathematical value in my opinion, but this one is really good. Though the required knowledge might not be learned until junior high.