What are some hidden elements that are related to futuristic transportation in Little Alchemy 2?

In Little Alchemy 2, there are several hidden elements related to futuristic transportation that you can discover. Here are some of the key combinations and steps to unlock them:

1. Rocket:
- Combination: Metal + Fire
- Steps:
- Combine Earth + Fire to create Lava.
- Combine Lava + Air to create Stone.
- Combine Stone + Fire to create Metal.
- Finally, combine Metal + Fire to create Rocket.

2. Spaceship:
- Combination: Rocket + Astronaut
- Steps:
- First, create a Rocket as described above.
- Combine Human + Moon to create Astronaut.
- Finally, combine Rocket + Astronaut to create Spaceship.

3. Time Machine:
- Combination: Clock + Electricity
- Steps:
- Combine Metal + Wheel to create Clock.
- Combine Metal + Energy to create Electricity.
- Finally, combine Clock + Electricity to create Time Machine.

4. Flying Car:
- Combination: Car + Air
- Steps:
- Combine Metal + Wheel to create Car.
- Combine Air + Air to create Pressure.
- Combine Pressure + Earth to create Stone.
- Combine Stone + Air to create Sand.
- Combine Sand + Fire to create Glass.
- Combine Glass + Air to create Airplane.
- Finally, combine Car + Airplane to create Flying Car.

5. Jet:
- Combination: Airplane + Energy
- Steps:
- Combine Metal + Wheel to create Car.
- Combine Car + Air to create Airplane.
- Combine Fire + Air to create Energy.
- Finally, combine Airplane + Energy to create Jet.

These combinations will help you unlock various futuristic transportation elements in Little Alchemy 2. Experiment with these steps and enjoy discovering new elements!