Colossal Biosciences revealed its small pack of genetically modified dire wolves. The company's "de-extinction" plans include the woolly mammoth.

Ethicists and conservationists appear to be divided over what the purpose of bringing back extinct species should be – and whether it matters.

Some of America’s greatest natural wonders don’t demand passports or plane tickets – they’re quietly waiting in places like northern Pennsylvania, where the Bucktail Scenic Byway cuts a 100-mile path ...