These people usually do business activities in handicrafts and man-made materials.

Humans began making glass about 4,000 years ago; it's the oldest man-made material after bronze.

He has disdained the man-made materials and, for the most part, the mass production that have been fundamental to modern design.

Working predominantly with found natural or man-made materials, each artist delivered a considerably different expression.

The garden can incorporate both natural and man-made materials.

Releases of man-made radioactive materials which occur during an industrial or research accident.

Mechanical valves are made of man-made materials and can usually last a lifetime.

Both classes include body parts, plants, natural phenomena, and man-made materials.

It may be used to date a wide range of natural and man-made materials.

Concrete is used more than any other man-made material in the world.