The question is one of the most hotly contested in palaeontology and revolves around an apparent gap in the fossil record immediately prior to the K-T boundary - the distinct layer of geological sediments separating the Cretaceous and Tertiary periods, and associated with a massive asteroid impact and global extinction event.

BBC: Closing the 'three metre gap'

The short-lived Fusion Garage Grid10 tablet also created such a distinct layer atop Android that the company dubbed it a new operating system: GridOS. However, while the company dissolved before any GridOS apps could be released, the tablet could run a wide range of Android apps downloaded from Amazon's Android app store.

ENGADGET: Switched On: Extreme takeover, Home edition

On its second quarter call, GE announced its plans to streamline its energy group by dividing it into three distinct activities and eliminating a complete layer of management at the top.

FORBES: GE's Immelt: Natural Gas Now Much Cheaper Than Nuclear

The result was interesting, Unlike pork, the wild boar ribs had two distinct layers, sort of like pork belly, with a layer of meat and a layer of fat almost perfectly split horizontally.

FORBES: Wild Boar: The Other Other White Meat?

It opts instead to integrate the information layer into the eye-line, which as Lee says is not distinct enough from a smartphone.

FORBES: Does Google Glass Spell The End Of The Smartphone Wars?