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Any time you hear a sound, it is because something is vibrating. Place your fingers against your throat and hum. You will feel your throat vibrate. We usually hear sounds from vibrations that travel through the air, but solids can be much better at carrying vibrations.
The following test is a way to evaluate your executive functioning. What is the world is that? Well, it means how good you are at telling your brain what to do, even if it wants to do something else.
A fun part of studying birds is learning about their behavior. If you understand what they do and why, you can use that knowledge to get a better look at them.
This illusion is so easy, and so good that you may have trouble believing your own eyes, much less making someone else believe that it is a simple illusion, and not a more complicated trick.
