Comments on this -soon to be a film!Seems like Heinlein intentionally paralleled the events leading up to the American Revolution.The only weapon the colonists seem to have besides Mike the computer is a BIG rail gun which they can hurl rocks at Earth.Is this possible?I am wondering if this story came after certain Heinlein stories set on Luna-like Menace from Earth.Would love to see a film of this book but NOT with T--C----e!