The Christina calendar, which dates time from the birth of Jesus, was formulated by

An ancient Greek philosopher was among the first to warn of water pollution when he wrote that "you cannot step twice into the same river."

Indicate whether the statement is true or false.

Which artist discussed in this chapter uses Japanese papers, gunpowder, and gunpowder fuses in their drawings?

a. Cai-Guo Qiang b. Kara Walker c. Michelangelo d. Francesco Clemente e. none of the above