This is a demonstration of an X-ray machine called a fluoroscope.
To use it, just "grab" the small wire-frame with your pointer, hold down the
button, and move it around.
You'll see the X-ray of the hand through this window!
Is it really so surprising that x-rays can go through solid objects?
Do you know why some things, like bones or metal, are more resistant
to x-rays than skin and muscle? Did you know that light can also penetrate some materials?