Last month I successfully juggled while flying down a zip line. I had tried the feat three or four times previously and I always dropped about halfway down the line. This most recent time, though, I made it the whole way (about 100 yards). Here is the video evidence, followed by some thoughts on the science behind it….
Between doing this zip line juggle and juggling while running (“joggling”), people often make comments to me that imply their confusion over the science of how it works. Many people think I need to throw the balls ahead of me in order to juggle while in forward motion.
The answer is, no, I do not. The balls are already in forward motion with me as I’m running or flying on a zip line. They are traveling the same speed as me, so when I toss them upward, they fly both up and forward without any extra forward effort on my part. If you were to stand in the back of a moving pick-up truck (do not attempt) and toss a basketball straight up, it would not fly behind you but rather in front of you as if you were standing still (as long as you are not going so incredibly fast that there is crazy wind resistance).
The problem with the zip line, though, is not the forward motion, but rather the spinning motion. That is what has always messed me up in the past. When I spin while juggling, I do need to overcompensate my throws in a particular direction to make up for the spin. When I successfully juggled down the zip line, I just happened to get the throws right based on my spins. It was tough, but certainly possible.
I ordered some silicone molds that make perfect ice spheres about the size of a baseball. I put them in the freezer and out came the ice balls for juggling. I went outside and tried them out.
I was able to do it – and of course my hands got very cold! The balls began to melt and in turn got slippery. But I could still maintain the juggle for about a minute or so. Maybe my next trick should involve some sort of mix of juggling these with fire torches. The fire and ice show. What do you think?
I can see some good teaching opportunities here too, such as the nature of water and how it can take on different properties. And how the hands are very warm and have the potential to melt ice fairly quickly.
I like finding neat science tricks and visual illustrations that can be used to help communicate Biblical concepts in teaching. I found this neat brain game trick which I like to call the “curved arcs” from Steve Spangler Science. He sells the pieces I bought below. But you can also make your own and he has instructions on his site. I made my own large versions out of wood. The pictures below are the smaller cardboard type.
At first glance, one may look smaller than the other.
You can especially notice how they appear different lengths when you position them like this.
This is the two pieces switched. Now the yellow one is “longer”!
But when you stack them (seen below), you realize they are the same size!
Most adults pick up on this pretty quickly. Kids take a little longer to agree with you, of course. But no matter your age, it is still a fascinating reality. Two objects of the exact same size can appear to be different lengths depending on how they are positioned relative to one another.
Clearly our eyes and brains can play tricks on themselves. And that is one of the points I like to make in teaching kids about the Bible. There are several connections you can make here.
One that I make is that we as humans are all equally fallen sinners before God. We might compare ourselves to other people and think, “Well, I’m not as bad as that person!” The truth is, all have sinned and have fallen short of the glory of God (Romans 3:23). When you put the two arcs on top of one another, you realize that they are the same. We are the same as humans as well in terms of our guilt before a perfect and holy God.
What metaphors or illustrations would you make with this brain game? Have you used any in the past? Let me know if you have any ideas!