Deep underground on the border between France and Switzerland, the world's largest particle accelerator complex will explore the world on smaller scales than any human invention has explored before.
CNN's Becky Anderson goes inside the tunnels of the biggest scientific experiment ever attempted.
Scientists Wednesday applauded as one of the most ambitious experiments ever conceived got successfully underway, with protons being fired around a 27-kilometer (17-mile) tunnel deep beneath the border of France and Switzerland in an attempt to unlock the secrets of the universe.