#2923: Scary Triangles

[Cueball points with a stick to a poster hanging behind him to the left. The poster has a diagram of a shark. The dorsal fin is shown above a wavy surface of water. The part of the outline of the shark that are under water are drawn in dashed lines. There are unreadable text in the top and bottom left corner, and two labels with lines that points to its dorsal fin and its gills. Cueball's stick points to the label near the gills]

Cueball: Today's marine biology lecture is on sharks. We all know them as the scary triangles of the sea, but recent research has revealed that the triangle is only a small portion of the shark - over 90% of it is hidden beneath the surface.