An alarming new study shows the overall population of butterflies is declining sharply. NBC News' Maya Eaglin spoke with scientists about why it's happening and how to stop it.

A stunning scene was caught on video in Hawaii, showing hot gases and lava swirling into the air, forming a rare lava tornado ...

In its quest to bring back the extinct woolly mammoth, a Texas bioengineering company has taken its first steps to genetically engineer "woolly mice." ...

Metro Pacific Hospitals, the first and largest private hospital group in the Philippines, re-introduces itself with a new brand name, a new logo, and a new promise as Metro Pacific Health, the heart ...

European leaders are seeking to contain the damage from President Trump and Ukraine's President Zelenskyy’s Oval Office clash ...