  At the time it celebrates one century of existence, general
relativity---Einstein's theory for gravitation---is given a companion theory:
the so-called teleparallel gravity, or teleparallelism for short. This new
theory is fully equivalent to general relativity in what concerns physical
results, but is deeply different from the conceptual point of view. Its
characteristics make of teleparallel gravity an appealing theory, which
provides an entirely new way to think the gravitational interaction.
