Physicists are hoping to find the first evidence of dark matter – a hidden substance that is thought to pervade the Earth and the Universe. BBC World Service science reporter Rebecca Morelle has been to Italy to take a look inside the Darkside-50 experiment at the Gran Sasso National Laboratory before it is switched on. Use the link above to access a three minute video that gives you an inside look at the Gran Sasso National Laboratory and the Darkside-50 experiment, an experiment searching for dark matter.
