It is true that science can not progress without research developed . Over time , some scientists have submitted their experiments , shocking public opinion , some reaching its goal and bringing a contribution to the evolution domain, while others are just spectacular failures . Scientists believe that experiments are those that facilitate breakthroughs useful then the whole world . However , there are bizarre experiments , carried out under controversial methods or whose purpose was not predicted . Unknown or unpredictable negative turned some projects, so that should not happen again .