Is the mass you start with is the mass you produce?

Yes, mass has mass. It is, therefore, matter. If mass did not have mass, then it is "something" with no mass. That would make it "non-matter" and perhaps it might be energy.

Law of Conservation of Energy

There are several reasons why mass-production is cheaper. The first is that more products can be made in the same amount of time as producing the products individually. An example is how the Lego...

Henry Ford created the technology to mass produce automobiles. WRONG!! Ransom Eli Olds was the first to come up with the technology for the production line. The actual first car to be produced in the...

The mass has been going on since the Last Supper, but now the congregations are bigger and the place is organised.