EyjafjallajokullApril 17, 1973: Three years after a cyclone brings tragedy to Bangladesh, the new nation's capital city of Dhaka is hit with a tornado that kills 681.

April 17, 1996: The National Cattlemen's Beef Association launches a furious counterattack against talkshow host Oprah Winfrey. A day earlier, Oprah hosted Howard Lyman, a cattle-rancher turned animal rights activist. The Cattlemen sued Oprah for defamation, inspiring so-called "veggie libel" laws against food disparagement in several states. She wins the case two years later.

April 17, 2010: Icelanders, angered at European bankers for their alleged role in ruining the Icelandic economy, watch a bit of unintended revenge unfold: The Eyjafjallajokull volcano (at right) erupts for a second time in a week, forcing the closure of airports in Copenhagen, Oslo, London, Paris, Amsterdam and Vienna. A little extra irony: Iceland’s Keflavik Airport, which is upwind from the volcanic ash that can cripple jet engines, stays open.

Photo: Brynjar Gauti/AP

This feature is compiled by Peter Dykstra, an MNN contributor and publisher of Environmental Health News and The Daily Climate.