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"We had crows literally come down and tap me on the head, trying to scare me," a man says of crows that aggressively swoop at humans.

The new standards are aimed at improving fuel efficiency and lowering emissions for medium and heavy-duty trucks.

When a pink flamingo in Brazil lost its leg, zookeepers got it a prosthetic leg. In Alberta, Canada, don't flush your goldfish down the toilet — they're multiplying in storm ponds.

Their role in moving major issues in the president's direction — from health care and trade to same-sex marriage and the Confederate flag — was remarkable.

California lawmakers have decided to tighten the criteria for parents to opt out of vaccinating their children. But some parents resent officials telling them how to care for their children.

In a 5-4 ruling, the court says the Environmental Protection Agency should have taken into account the costs of complying with regulation.

Lawmakers in hard-hit Western states are pushing for suspensions to the Endangered Species Act to free up stored water. But an entrenched partisan divide over the law continues to be a hang-up.

The American chestnut is poised to return — as a bionic, blight-resistant tree. Scientists hope to plant about 10,000 transgenic plantlets to pollinate trees in the "wild."

Treated sewage water accounts for half the water used by Israel's farms. Entrepreneurs are experimenting with ways to cut costs and to ensure that the 86 percent of wastewater that's recycled is safe.

For the first time ever, the U.S. Army Corps of Engineers has closed part of a navigable waterway to stem the migration of an invasive species.