If you think you're too small to have an impact, try going to bed with a mosquito in the room.

Related:

• If you are going to try cross-country skiing,
  start with a small country...
• You have too mech room in the house and not enough
  room in the medicine...
• Try hacking in the wee hours:
  you will have more room...
• You can take all the impact that science considerations have on funding decisions at NASA,
  put them in the navel of a flea, and have room left...