&gt; <i>&quot;It is impossible to be interested in cosmology today without being interested in dark matter&quot;, says Stefano Liberati</i><p>Mr. Liberati seems to think dark matter is as real and proven as the air we breathe, but forgot that so far it is only one of ideas proposed to explain the speeds of visible bodies. I am sure one can study other ideas that do not depend on the concept of electromagnetically passive matter at all, like different gravity formula or EM mechanisms. Perhaps he meant to say it is impossible to get a grant or get attention without being interested in dark matter, or something like that...