Robin Williams, Brendan Fraser join Discovery's 'Curiosity'

Robin Williams, Samuel L. Jackson and Brendan Fraser have signed on as hosts for Discovery Channel's upcoming series "Curiosity," the cable outlet announced at the Television Critics Assn. press tour on Friday.

The series, which premieres August 7 at 8 p.m., will explore various mysteries. Williams will delve into the topic of how drugs work; "The Mummy" actor Fraser will ponder what lies beneath the ground in Egypt; and Jackson will reflect on how the world might end.

The series will also feature "Avatar" actress Michelle Rodriguez exploring whether the human race is ready for an alien invasion, and "Secretary" star Maggie Gyllenhaal diving into the topic of why sex is so fun.

"Curiosity" was created by John Hendricks, founder and chairman of Discovery Communications.