Read the following paragraph and answer the question. Give ONLY the answer, no other words or explanation.

For example:

Answer: <most likely answer, as short as possible>.

Paragraph: Graphene looks like it 's going to be one of the " wonder materials " of the future , and a science team at Cornell University have just demonstrated the world 's smallest balloon made of it .

Question: Why are the scientists so excited about Graphene ?
The scientists believe that the material is light .
Graphene is considered a 'wonder material' for its unique properties.