Vertically aligned carbon nanotube arrays

He became the organization's first president and led it for nearly four decades, helping establish organized labor as a major force in American industry.

Answer four: The extremely dark material whose name combines an acronym and a color is [bell dings] Vantablack.

Developed by Surrey NanoSystems, the material absorbs more than 99.9% of visible light.

Its name combines Vanta, which stands for vertically aligned nanotube arrays, with the color black.