Make multiple images of yourself.
A magnet falls more slowly through a metallic tube than it does through a nonmetallic tube.
Start your own electric flea circus!
What's your (electrical) sign?
See yourself become someone else.
Now you see it; now you don't. An object without a sharp edge can fade from your view.
Prove to yourself that Galileo was right!
Your experience of the world influences what you see.
Make a portable cloud in a bottle. Now you see it, now you don't!
Caged molecules do their thing.
Build a geyser and observe its cyclic nature.
A lens creates an image that hangs in midair.
Create a series of boundaries that keep some things out while letting other things through.
Dark-colored materials both absorb and emit energy more readily than light-colored materials.
Why is the sky blue? That's a sticky question.
Without a boundary, it's hard to distinguish different shades of gray.