Which spice imparts a distinctive flavor and yellow color to curry powders?

Turmeric

Which dessert item uses egg whites whipped until stiff, then baked or dried to achieve crispness? Which French dish consists of vegetables baked slowly in herbs and olive oil? Who recorded the 1999 hit "Smooth" featuring Rob Thomas? What chemical substance provides pigment for human skin color? Which Nintendo arcade game involved controlling a character spraying insecticide?