Listen to your inner child

There's nothing healthier you can do than to continue to listen to your "inner child" as you grow older. This site, Science Hobbyist, will help you in that endeavor. Some samples:

Sit in a sunbeam in a dimly-lit room. Light a stick of incense, hold it vertically, then move it upwards and stop suddenly, with a jerk. A perfect smoke-ring will be launched from the burning tip. Move the incense upwards, then suddenly jerk downwards, then repeat. You can launch fast smoke-rings through the center of slow ones, create side-by side rows, etc. In a draft-free room they persist for ages, and soon the air will be full of huge grey thin circles.

Create REALLY BIG "static" sparks: on a winter's day, scuff your feet on the rug so that your body becomes electrified. Now stand near a victim. Wiggle your shoes while pressing on the rug, so that you build up some charged footprints. Now suddenly LEAP INTO THE AIR and touch your victim with your finger at the same time, while you're still in flight. The spark will be much stronger than normal.

While waiting in the dark outside a movie theater or pub, violently shake your head back and forth while observing nearby neon signs. (this only works with clear-tube orange signs.) See those frilly filgerees in the bands of light? All neon signs have them, but normally they wiggle back and forth so fast that humans can't see them. Physicists call them "positive column striations," while neon signmakers call them "jellybeans". Tell bystanders what you are doing, and soon you'll have a crowd of people shaking their heads in the dark like fools.