  The cannonball model of GRBs is very overt (and, thus, falsifiable) in its
hypothesis and results: all the considerations I review are based on explicit
analytical expressions derived, in fair approximations, from first principles.
The model provides a good description of all the data on all GRBs of known
redshift, has made correct predictions, and is unprecedentedly self-consintent,
simple and successful.
