Buehler used this new method to analyze a collection of 1,000 scientific papers about biological materials and turned them into a knowledge map in the form of a graph.

Houses were graded in the census of the time from 'first-class' to 'fourth-class' according to their size and the materials used in their construction. According to official classification, 22,701 ...

While the mass of materials actively used by humans, including concrete, plastic and asphalt, weighed in at 1.15 trillion tonnes. The technosphere weighs more than all life on Earth (trillion tonnes): ...