Friday links

Video: The Hand-Cranked Wintergatan Marble Machine Uses 2,000 Marbles to Make Music.

March Forth: Today is National Grammar Day.

Army Candidates Take Exam in Their Underpants to Prevent Cheating.

Tomorrow is the anniversary of Winston Churchill's Iron Curtain speech.

The Gruesome And Mysterious Case Of Exploding Teeth.

A Complete History of the Millennium Falcon

ICYMI, Wednesday's links are here, and include Dr. Seuss' book of nudes The Seven Lady Godivas, why we say 'eleven, twelve' instead of 'oneteen, twoteen', bicycles as a moral threat (in the 1890s), and a 1970s-era Air Force rescue beacon disguised as dog poop (plus lipstick guns and shoe transmitters).