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Quick! What’s behind you right now? Did you peek over to see desks, the wallpaper, students, books, or toys? Were those objects there even before you looked at them? Are they there now, even though you’re reading this instead of seeing them? As strange as it sounds, some scientists believe that nothing exists definitely until someone measures it, such as you did with your eyes and ears. These scientists work in a field of science called Quantum Mechanics.

In the early 1900s, smarty-pants scientists like Albert Einstein, Niels Bohr, and Werner Heisenberg studied, experimented and argued over the question of what light was made of. Light was very mysterious to scientists at the time, because in some experiments it acted like a wave, similar to the invisible radio and magnetic waves all around us. In other experiments though, light acted like a particle, a solid object like a Pop Tart, a textbook, a penny, a skyscraper… Anything that’s in one place and that weighs something is a particle. It didn’t seem to make sense for something to be an invisible wave and a solid particle at the same time, but in test after test, light was both! You might think it was time for these scientists to turn in their labcoats and get new jobs… this was too hard to figure out! Instead of giving up though, the scientists continued experimenting and studying the subject until they found a solution: light is a wave until it gets observed, then it becomes a solid particle!

This was huge news for scientists. If light acts like this, then other solid objects may not be so solid after all too. The scientists studying Quantum Mechanics presented this thought-provoking possibility: that that the world is actually a wave of possibilities until we observe it, then it becomes the solid place we can feel, touch, taste and smell. It’s a bit like hiding trash under your bed: if you can’t see it, it’s not there!