The famous paintings on the walls of caves in Europe mark the beginning of figurative art and a great leap forward for human culture.
But now a novel method of determining the age of some of those cave paintings questions their provenance. Not that they're fakes — only that it might not have been modern humans who made them.
The first European cave paintings are thought to have been made over 30,000 years ago. Most depict animals and hunters. Some of the eeriest are stencils of human hands, apparently made by blowing a spray of pigment over a hand held up to a wall.
Fifty years ago three men set out into the frigid waters of the San Francisco Bay in a raft made out of raincoats. It was one of the most daring prison escapes in U.S. history from what was billed as the nation's only "escape-proof prison" — Alcatraz.
Most people assume the men have been at the bottom of the bay or were swept out to sea since the night they broke free, tunneling out of their cells in part with spoons from the kitchen and climbing the prisons' plumbing to the roof.
Fifty years ago, three men set out into the frigid waters of the San Francisco Bay in a raft made out of raincoats. It was one of the most daring prison escapes in U.S. history.
As one newsreel put it: The spoon proved "mightier than the bars at supposedly escape-proof Alcatraz prison."
"Three bank robbers serving long terms scratched their way through grills covering an air vent, climbed a drainage pipe and disappeared from the forbidding rock in San Francisco Bay," the report continued.
Survivors say the wall of water was like a tsunami that destroyed nearly everything in its path as it roared through a Black Hills canyon and into town. The flash flood that hit Rapid City, S.D., on June 9, 1972, was one of the worst floods in U.S. history. It killed 238 people and damaged or washed away more than 1,300 homes.
On Saturday, the city will read the names of those who died and reflect on how the flood changed the way the city and others towns across the country built themselves.
When it announced that nearly 4,400 post offices would be studied to see if they should be closed, the U.S. Postal Service did not "define and implement a clear process that will protect the historic buildings in its inventory," the trust says.