Studying teeth with state of the art technology is helping to unlock previously hidden secrets about the Neanderthals' lifestyle.

BBC: How scientists recreated Neanderthal man

ZombiU continues to be well-received by audiences and features second-screen game play that uses the Wii U GamePad controller to manage items or scan for hidden secrets in real time.

ENGADGET: Nintendo announces new ZombiU Deluxe Set Wii U bundle for $390

The halls were strewed with NFC-powered "smart" posters that would unlock all manner of hidden secrets if you tapped them with your smartphone, from restaurant information to directions to the nearest restrooms.

WSJ: Is NFC Finally Becoming Mobile's Next Big Thing?

The same fundamentals apply in opening puzzle boxes from Hakone, Japan: something appears impossible to circumvent until you figure out the secret, and locks, just like the secret boxes, are all about hidden secrets.

FORBES: Japanese Secret Boxes: The Coolest Security Puzzles for Kids and Adults

"You do not keep secrets hidden about dangers to children, " Mr Clark told a news conference in Portland on Thursday.

BBC: Boy Scouts release files on suspected child sex abusers

But the mysterious planet holds terrifying secrets, hidden in the sand.

ENGADGET: BBC America HD launch July 20 brings plenty of science fiction starting with Torchwood & Dr. Who

Johnston, a Pulitzer Prize-winning reporter formerly at The New York Times, reveals secrets on everything from hidden fees to the ways insurers wiggle out of paying for care.

FORBES: Why the Fine Print Is Even Worse Than You Think

Another of the terminal's great subterranean secrets is M42 -- a hidden basement and the deepest accessible underground point in Manhattan.

CNN: Memorable moments in Grand Central's 100 years