Related Clues:

• Intervals quietly employed in empty talk
• A writer to entertain this writer -- altogether subhuman types?
• Chronology holes
• Ancestors revealing the last word in exercise? Other way round
• The hypothetical humanzees, e.g
• Deficient areas
• Knuckle-draggers
• Old relatives occasionally upset inside? So be it
• The differences between rich and poor, for instance, gave the creeps to both sides
• Our ancestors, hypothetically
• Generational differences
• Spaces between things
• Things in need of filling
• Extinct human ancestors
• Dental features like Michael Strahan's