18. Choose the correct match:

1. Aspartame: Natural salt variety recently extracted from bacteria in International Space Station

2. Graphene: Allotrope of Fluorine that displays superconductivity

3. Quantum Dots: Large dark spots found only on surface of Sun and Jupiter

4. Maglev: Fast and efficient way of rail transport that uses electromagnets

Correct Answer :

Maglev: Fast and efficient way of rail transport that uses electromagnets