Which bird constructs floating nests anchored within aquatic vegetation

Grebe

Who is the Greek goddess of wisdom, craft, and war? In the movie "Elf," what food does Buddy pour syrup on reference from the four main food groups elves eat? Who commanded the Confederate surrender to Union General Ulysses S. Grant at Appomattox Court House? What player holds the record for most stolen bases in MLB history? What do mathematicians call angles that share a common side and vertex?