Ted KaczynskiApril 24, 1916: As part of one of the most remarkable rescue stories in history, Ernest Shackleton launches a lifeboat for a fifteen-day journey across brutal, open-ocean conditions from Elephant Island to South Georgia in the Antarctic. Shackleton rescues his entire crew after a two-year ordeal following the wreck of the Endurance, his Antarctic exploration ship.

April 24, 1995: The New York Times receives an immense, rambling essay with an ultimatum attached: Publish this and we won't blow anyone else up. A year later, the "Unabomber," reclusive college professor Ted Kaczynski (at right), is arrested at his cabin in Lincoln, Montana. Kaczynski receives a multiple life sentences for his 20-year bombing spree that kills three and injures 23. His targets were people he thought were harming the environment.

April 24, 2010: A leak is discovered from the site of the destroyed Deepwater Horizon drilling platform. The original estimates of 1,000 barrels of oil per day prove to be a dramatic underestimation.

Photo: John Youngbear/AP

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