These "I" and "E" vowels are formed by putting your tongue forward in the mouth. That's why they're called "front" vowels. With these words, your tongue depresses and folds back a bit. So "O", "A" and ...

The mammals' mysterious clicks contain a stunning level of complexity, a new study shows. A group of sperm whales (Physeter macrocephalus) swims together in the Indian Ocean. For years, researchers ...