Well, according to E=MC2
Mass is the same as energy divided by the speed of light squared.
But currently no, mass cannot be created.
Mass can not be lost. According to the Law of Conservation of Mass, matter can not be created or destroyed.
Just as the laws of conservation of matter, mass, and energy state that matter, mass, and energy cannot be created nor destroyed (in the long-term), so too do we say that particle characteristics (which derive from matter/mass/energy) such as charge cannot be created nor destroyed.
Conservation of mass... but this has been slightly revised since. Now it is the conservation of energy. Mass can be converted to energy. In some chemical reactions in the early 20th century scientists observed that the mass of the reactants did not equal the mass of the products. This was ultimately resolved with Einstein's mass-energy equivalence formula, E = mc^2, where Eistein postulated that some rest mass was converted to energy. From this, we know that energy cannot be created or destroyed.
Because there is a law of nature that says that matter (mass) can neither be created nor destroyed. However, Einstein proved that mass and energy are actually the same thing (E=MC2), so mass can be turned into energy and energy can be turned into mass.
Weight-hangers are used to add desired amounts of weight to create the mass needed. The mass created is used for experiments involving mass, acceleration and force.
Slaves Mass was created in 1977.
Blanck Mass was created in 2011.
Mass Observation was created in 1937.
Mass - film - was created in 2004.
Plague Mass was created in 1990.
Crystal Mass was created in 2000.
Mass - novel - was created in 1973.
Mass mvmnt was created in 2004.
Sayla Mass was created in 1979.
The Mass Missile was created in 2000.
Mass Party was created in 2006.
MASS Engineering was created in 1998.