Which innovative building material was developed in the 1990s using recycled paper products and has since become popular for sustainable architectural applications?

The architecture industry constantly evolves through innovative materials that reshape design possibilities. Some breakthrough products have fundamentally changed how architects approach sustainability, structural integrity, and aesthetic expression. Test your knowledge of game-changing architectural materials that have revolutionized the industry in recent decades.

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Papercrete (a mixture of recycled paper pulp, portland cement, and clay that creates lightweight, insulating building blocks)
Aerogel panels (transparent silica-based insulators developed by NASA that offer exceptional thermal properties)
Self-healing concrete (concrete embedded with bacteria that activate when cracks form, secreting limestone to repair damage)
Cross-laminated timber (engineered wood panels with layers glued perpendicular to each other for structural strength)