Allan Sloan a Senior Editor at fortune magazine explains how lenders were able to issue subprime mortgages to borrowers.

Richard explains file compression and his new "Middle Out" algorithm at Pied Piper's pitch at TechCrunch.

Sean Kingston sings about the two different types of "c": the hard and soft "c". The hard "c" sounds more like the letter "k", while the soft "c" sounds more like the letter "s".

Attempt after attempt, Fei Fei finally figures out the missing piece to building her rocket. As she revises her plan, she starts to explain F = mg formula.

This clip describes the history of physics and chemistry experiments that led to proving the existence of atoms.