1. When a dis­tin­guished but eld­erly sci­ent­ist states that some­thing is pos­sible, he is almost cer­tainly right. When he states that some­thing is impossible, he is prob­ably wrong.
  2. The only way of dis­cov­er­ing the lim­its of the pos­sible is to ven­ture a little way past them into the impossible.
  3. Any suf­fi­ciently advanced tech­no­logy is indis­tin­guish­able from magic.

by Arthur C. Clarke