Muon

Scientists have discovered a secret, giant void hiding inside the Great Pyramid of Giza in Egypt. Located above the pyramid's Grand Gallery, the 30-meter-long void inside Khufu's Pyramid remains a mystery.

Its size suggests it plays an important role in the tomb's structure. It's the first discovery of its kind since the 19th century.

From the Giza pyramids to the pharaonic tombs of Luxor, Egypt's ancient monuments are holding onto mysteries which researchers now aim to unravel with cutting edge technology.

Takaaki Kajita of Japan and Arthur McDonald of Canada were awarded the Nobel Physics Prize on Oct. 6 for resolving a mystery about neutrinos, a fundamental but enigmatic particle.