Today a funny article appeared online:
R. Ahuja et al., "Relativity and the Lead-Acid Battery", Phys. Rev. Lett. 106, 018301 (2011)
Scientists from Uppsala and Helsinki calculated the voltage produced by a lead-acid battery (such as we got in cars). The theory yielded 2.13 V, which is in compelling agreement with experiment (2.11 V).
The funny part is that most of this voltage (1.7-1.8 V) arises from the relativistic effects in Pb compounds.
As the authors put it: "Finally, we note that cars start due to relativity."