Whale flipper windmill
Preliminary tests show that bumpy-edged windmill blades, modeled after the flipper of humpback whales, can be angled more steeply than traditional blades without stalling. Designers say this turbine is more efficient.
Preliminary tests show that bumpy-edged windmill blades, modeled after the flipper of humpback whales, can be angled more steeply than traditional blades without stalling. Designers say this turbine is more efficient.
How some veterans of the wars in Iraq and Afghanistan are helping turn around a drug-infested neighborhood of Baltimore – and themselves.
What happens when ordinary people decide to pay it forward? Extraordinary change. See how individuals are making a difference...
Pastor Jean Enock Joseph (c.) visits one of his projects in Croix-des-Bouquets, just outside Port-au-Prince, Haiti’s capital.
Jean Enock Joseph teaches self-help to lift Haiti
Pastor Jean Enock Joseph doesn't shy from Haiti's toughest problems. His message: Haitians have the ability to help themselves.
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