Related Clues:

• Homo sapiens
• 'Goodness!'
• ''Wow!''
• Sound of surprise
• Date or age beginning
• Dude
• See 27-Down
• ''Amazing!''
• See 34-Down
• The human race
• 'Oh, brother!'
• 'How about that!'
• ''I didn't know that''
• ''I'm impressed!''
• Word said while scratching the head