The Indian Removal Act signed by President Andrew Jackson in 1830 authorized the federal government to relocate tribes within state borders to unsettled land west of the Mississippi River. When white ...

Birds and reptiles may not resemble humans in many ways, but they cry similar tears. The composition of human tears is well known, but until now, there was very little research into the composition ...

A new study adds to evidence suggesting that people's perceptions of others' tears as sincere or manipulative likely depend on a variety of contextual factors. The findings suggest tears may be ...

Hi Grace, thank you for a great question. We cry, or make tears, for three reasons. First, we need tears to keep our eye healthy, so you can say that our eyes cry a little bit all through the day.

All humans cry. Some of our tears are meant to keep our eyes moist and healthy. Others clean out the eye from dust, pollens and other pollutants. Emotional tears play another role. Although triggered ...

It’s been said that angry tears are salty and happy tears are sweet. Whether or not that’s actually the case, it is true that not all tears are the same. Tears from chopping an onion are different ...

Testing for nutritional deficiencies in blood can be invasive and expensive. A team led by Michigan Technological University explored what it takes to switch to tears instead. Babies cry easily, but ...

Dr. Arianne Pontes Oriá stands firm: She does not make animals cry for a living. Technically, only humans can cry, or weep in response to an emotional state, said Dr. Oriá, a veterinarian at the ...