According to Mond, what is dangerous about science? What limits are imposed on scientific inquiry

Mustapha Mond posits that science cannot be the only factor in progress. Throughout the novel, the inhabitants of civilized society learn to regard scientific progress as the greatest good, but science often illuminates facts that do not profit an individual's happiness. Progress often makes life more difficult for some and easier for others. Science can thus be a destabilizing force in society. 

"It isn't only art that's incompatible with happiness; it's also science. Science is dangerous; we have to keep it most carefully chained and muzzled."