ALT Today in one sentence: Global stock markets fell sharply as worries about the U.S. economy sparked a world-wide sell-off; after weeks of being noncommittal over the Sept. 10 ABC News debate he previously agreed to, Trump said he’ll instead debate Harris on Fox News – or not at all; Justice Clarence Thomas failed to publicly disclose additional private travel provided by Republican megadonor Harlan Crow in 2010; Justice Neil Gorsuch warned Biden about his Supreme Court reform proposals: “Be careful”; former Trump campaign attorney Jenna Ellis agreed to cooperate with prosecutors in Arizona as part of the state's "fake elector" case; and a Los Angeles man, who launched an independent campaign for president after discovering a dead worm in his brain, confessed to Roseanne Barr that he left a dead bear cub in Central Park in 2014 because he thought it would be “amusing."