DiFrancesco, overcome with smoke, turned back up the stairs, but Clark -- breathing and seeing "as if I had a bubble over my head" -- soldiered on.

CNN: An improbable escape

Thought bubbles (picture the dialog bubble above the head of a comic strip character) are the unspoken attitudes, assumptions and beliefs that color our view of the world.

FORBES: It's Time For Our Leaders to Start Acting Like Leaders, Part II

Seated just ahead of me, his head inside a second bubble, sat Graham Hawkes, the craft's creator and pilot.

FORBES: Cruising Altitude: Minus 400 Feet

It was as though my head was in a bubble, and the world and my film were far, far away in the background.

NPR: A Comic Horror Story from Aspen

For milk tea-flavoured popcorn, a popular sweet, South-East Asian fusion of tea and milkshake that also goes by the name of bubble tea, you will have to head to the nearby Tokyo DisneySea, a separate park with water slides and watery rides.

BBC: Different Disneylands around the world

Unemployment, now 3.9%, may head back towards the post-bubble high of 5.5%.

ECONOMIST: Japan

"US liquidity concerns following the Fed minutes looks like the pin which will burst the recent bubble in equities, " said Mike McCudden, head of derivatives at Interactive Investor.

BBC: Stock markets fall after US Fed comments