- What goes up, must come down.
- You never want to start anything with a headache.
- New discoveries are always being made.
- Vectors, vectors, vectors.
- It doesn’t hurt once you get used to it. Some people even enjoy it.
- One word: Friction.
- Size isn’t everything. Sometimes the smaller ones take longer to do.
- For every push there’s an equal and opposite shove.
- Simple harmonic motion.
- It’s always fun to experiment.