Made mostly of calcium compounds, what is the main tissue beneath a tooth's enamel?

Pop singer Yvonne Elliman played Mary Magdalene in which 1973 musical film? The Greek sea god Poseidon corresponds to which Roman god? President Clinton's torn tendon in 1997 was an injury to which joint? What was President Reagan's alliterative description of the USSR, which he softened at a 1988 summit? IKEA founder Ingvar Kamprad famously drove an old 240 GL from which European auto company? PZZA is the stock symbol that made a lot of dough for John Schnatter and which company? Who won the Best Actor Oscar for "Rain Man" (1988)? Reichenbach Falls in Switzerland was the setting of which literary hero's reported death?