> As far as we know, nothing can travel faster than "c" What Relativity forbids is anything traveling as fast as c, as the increase in mass as c is approached

> As far as we know, nothing can travel faster than "c" What Relativity forbids is anything traveling as fast as c, as the increase in mass as c is approached would require infinite energy to reach. Relativity says absolutely nothing about faster than c, i.e. it does not forbid things such as the theoretical tachyon.