As with his predecessor, this Furby's got eyelids, though they play a fairly limited role, like opening up when it wakes up from sleep mode.

ENGADGET: Furby gets a reboot for 2012, we go hands-on (video)

But crystal fibres push the range of single-mode wavelengths right into the visible part of the spectrum, opening up huge new tracts of wavelength for telecommunications.

ECONOMIST: A new approach to making optical fibres

It's also why the default behavior in opening photos and videos is to use the new full-screen viewers in the start screen mode.

WSJ: Mossberg's Mailbox: Opening Photos and Videos on a Windows 8 Machine