Which of these materials is known for being an ultralight solid derived from a gel, often called 'frozen smoke' due to its low density? ☁️
Difficulty: Easy
Which material is famous for its 'shape memory' property, allowing it to recover its original shape upon heating after being deformed? 🔄
Difficulty: Medium
Which material is a two-dimensional carbon allotrope that, when assembled into a 3D porous structure, creates a super-elastic and highly conductive aerogel? 🕸️
Difficulty: Hard
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