The United States joined the First World War on April 6, 1917: some history, a brief documentary and archival footage.
These 10 companies control everything (edible) that you buy.
In 1650, here’s how you could dye your hair blond.
Map: watch as the world’s cities appear one-by-one over 6,000 years.
Victorian ‘Coffin Torpedoes’ Blasted Would-Be Grave Robbers.
ICYMI, Friday’s links are here, and are all April Fool’s Day related: history, pranks, and hoaxes.