According to Dyson, the graviton can't be detected, Planck's time can't be measured...‏

• 
  

Freeman Dyson 

Explaining How Two Systems Of The World Can Both Be True

Professor of Physics, Institute for Advanced Study; 

Author, Disturbing the Universe; Many Colored Glass

http://www.edge.org/responses/what-is-your-favorite-deep-elegant-or-beautiful-explanation