DNA is the operating software for our bodies.
The solar system is a bunch of objects pulled into spherical shapes by gravity, the biggest of which is at the center, and that centerpiece is on a burning 10-billion-year (more or less) life cycle. The other things are various forms of rock and gas, are much smaller, and revolve around the centerpiece.
A black hole is where things collapse so violently and completely that nothing gets out.
Electricity is the jumping of ions, from where they're crowded together too much, to a part where there's more room for them, and they're such an energetic crowd when they move that things in their way can get hurt. (Not really, but as a general idea in some cases.....)
Just don't ask me about magnetism.
