Related Clues:

• Thomas Lincoln, to family
• Bit of whipped cream
• Tiny building block
• Infinitesimal bit
• Little 'un
• Small boy
• It's smashed in a lab
• Unit of matter
• Bohr study
• Physicist's focus
• Cyclotron particle
• Sliver
• Sponge gently
• Microscopic bit
• Subject for Fermi