This is the only known footage of Mark Twain, filmed by Thomas Edison in 1909.
Trevor Prideaux has become the first person to have a cell phone built into his arm.
As the ice sheet covering Greenland melts, it gets darker. Which encourages more melting. And here's a visual from NASA showing how the water covered by ice sheets in the Arctic have decreased by over 4 million square miles below the average for this time of year.