The Athenian Agora. The Agora of Athens was the center of the ancient city: a large, open square where the citizens could assemble for a wide variety of purposes. On any given day the space might be used as a market, or for an election, a dramatic performance, a religious procession, military drill, or athletic competition.
Bear spray is a non-lethal bear deterrent designed to stop aggressive behavior in bears. Its use can reduce human injuries caused by bears and the number of bears killed by people in self-defense.
A polar bear reacts with light just like a big pile of snow. There are actually two layers of fur; an under layer made up of soft, wooly hairs which help to insulate the skin, and a top layer with longer, stiffer hairs (called guard hairs) which are covered in oil to keep the bottom layer from getting wet.