Grow a Brain !!! - Take the challenge.
Dark Matter is Scientific KAKA
If DARK MATTER existed (IT DOES NOT) then it would already have been measured in just about everything we weigh and that Kilo of gold and Meter rod stored in France as basic units of Metrics would both be affected by Dark Matter just like all the gold in Fort Knox and.....
Archimedes would have had an immanently harder problem as all gold would possibly vary for the same size as some might varying contain dark matter and your brain one side disproportionately full of it would cause your head to tilt uncontrollably to one side.
Do a test get some gold from a fine mould and test or milk bottles with milk or a very thin rod of gold versus an ingot of gold -which would weigh more.
Definition {Dark Matter is that real world matter that is unobservant due to being too far away) that's why we don't find it in the street next to the parked car or on the dining room table