Typically, someone who is in agreement with you will smile and nod as you speak. (Disagreement shows up in compressed or pursed lips, clenched jaw muscles, or a head turned slightly away, so eye contact becomes sidelong.) But smiles are often used as a polite response and to cover up other emotions.

FORBES: Body Language Savvy for Sales

Out of habit, you nod and mutter that you understand.

FORBES: 8 Ways To Rebound From A Demotion

"All of this cooperative stuff always sounds great, and you'll get any group of intelligent people to nod their head yes, " he said.

WSJ: Reaching Outside The Ivory Tower

Slide the padlock icon to the right and it unlocks the handset, slide it to the left and you're dropped into the camera app (a clear nod to HTC's Sense 3.0 UI).

ENGADGET: Galaxy Nexus HSPA+ review Mobile

You always hope that this is a nod towards the future and that's the direction the game is going to go.

BBC: Attack best form of defence

In the spirit of the history of this -- and as a nod to what might have been -- we leave you with a parting gift of music.

CNN: Why 'Hail to the Chief' remains unsung