That matters because theory suggests that the maximum sustainable yield that can be cropped from a fishery comes when the biomass of a target species is about 50% of its original levels.
" There was a cast of a dinosaur bone and you can scan the QR code on the computers and it will tell you all about where it was found and all sorts of stuff about it, " he said.
The president also called Hagel exemplary and says his decision to resign didn't come easily, but several sources told CNN that the president forced Hagel out.