Beakman challenge: make a can come to you when you call it. Beakman rolls a can away and it rolls back. Using a coffee can, two plastic tops, rubber band, small sticks, scissors, tape and a weight (like an old battery), Beakman creates a coffee can that, when rolled, causes the rubber band to twist up. The stored energy of the twisted rubber band has to go somewhere, so it unravels it self causing the can to roll back where it started.
Beakman explains what adhesion and surface tension are while making DIY bubbles. Then using a rubber band, he shows that the soap film will stick to any edge inside of the rubber band regardless of shape. If you remove the rubber band, then the molecules will stick together in their smallest shape which is a sphere. Then a man demonstrates that there can be square "bubbles" and rainbow shaped "bubbles."
Beakman challenge: put a skewer through a balloon without popping it. The stretched rubber acts like a coil, and when it's stretched, it pushes away, and the balloon will pop. However, if you find a part of the rubber that's not stretched (the ends), then it will push together and allow the skewer to go through.