The five most popular CNN.com stories during the last 24 hours, according to Newspulse.

Mysterious fireball lights up sky: A flash of light, later explained to be part of a meteor shower, was spotted over Iowa and Wisconsin. (No audio)

Massive fireball reported in Midwestern sky: Authorities in several Midwestern states were flooded Wednesday night with reports of a gigantic fireball lighting up the sky, the National Weather Service said.

SEC charges Goldman Sachs with fraud: The Securities and Exchange Commission on Friday charged Wall Street's most gilded firm, Goldman Sachs, with defrauding investors in a sale of securities tied to subprime mortgages.

GE: 7,000 tax returns, $0 U.S. tax bill: General Electric filed more than 7,000 income tax returns in hundreds of global jurisdictions last year, but when push came to shove, the company owed the U.S. government a whopping bill of $0.

Willie Nelson talks smoking pot: CNN's Larry King talks to legendary singer Willie Nelson about why he supports marijuana legalization.