Whether you think it's cute, or it makes you squirm, baby talk is a compelling scientific phenomenon. All around the world, people use a special register when they speak to the very young. This infant-directed speech, or IDS, is recognizable for its higher pitch and more melodic, emotionally-charged tone.
Bilateral leg edema is swelling of the soft tissues of the legs. The condition can be merely a daily nuisance, or signal a serious underlying condition. A physician should be consulted to determine the cause and begin appropriate treatment.
Scientists claim that walking on two legs was one of the keys to humans' development from ancient ape-like ancestors. Walking on two legs saved energy and allowed the arms to be used for activities like hunting, crafting simple tools and interacting with objects. Charles Darwin proposed long ago that having two limbs free to use tools constituted a key element of advanced intelligence [source: National Geographic].