While the London Underground has been made more accessible in recent years (more than 60 stations out of 270 are now step-less between the street and the platforms), many Tube stations still present challenges for the disabled due to gaps between the platform and the carriage door.

BBC: London for disabled visitors

In Round 1 of the PIF program, the RFP-EZ team opened the door to small businesses by building a platform for small, creative businesses to more effectively sell to the Federal Government.

WHITEHOUSE: Presidential Innovation Fellows

He gave it to me, and I went and knocked on his door, dressed like David Bowie -- big old high heel platform shoes, satin pants, probably had make-up on, with a Les Paul and a notebook pad with all kinds of lyrics in it.

CNN: Sammy Hagar remembers Ronnie Montrose