Related Clues:

• Molecular component
• Power source
• Unpaid servant
• Asimov topic, often
• Sci-fi staple
• Kind of number or energy
• Smasher bit
• Type of power or clock
• Like the modern age
• Lab particle
• Teensy particle
• It's a small thing
• Democritus' unit
• Molecule piece
• Assembly-line worker