Who Were the First Americans?A letter to the editor is presented in response to the article "America, in the Beginning" from the September/October 2014 issue regarding speculation on how humans reached the Americas.MartinJulieEBSCO_AspArchaeology...
The first wave of humans into the Americas during the last ice age may have hailed partly from northern China, according to a DNA study of ancient and modern Indigenous people.When you purchase through links on our site, we may earn an affiliate commission. Here’...
Several years ago, when my grandparents were well into their 80s, they were no longer able to care for themselves very well. My grandfather was afraid of leaving the only home they had known for the past 60 years. The idea of having to sell their home and move into a retirement home w...
Social status can have striking effects on health in humans and other animals, but the causes often are unknown. In male vertebrates, status-related differ... EA Archie,J Altmann,SC Alberts - 《Proceedings of the National Academy of Sciences of the United States of America》 被引量: 141发表...
If the sources of heterogeneity are observed (e.g., gender), the sample can be split into g... GH Lubke,B Muthén - 《Psychol Methods》 被引量: 890发表: 2005年 Why Humans Have Sex Historically, the reasons people have sex have been assumed to be few in number and simple in nature...
This is one reason why investigations are important in science. Albert Einstein, who developed the Theory of Relativity, arrived at the theory through mathematics. The accuracy ( 正 确性 ) of his mathematics was later tested through investigation. Einstein's ideas were proved to be correct. A ...
There were no forests in the Southwest region There were no forests in the Southwest region. The land was rocky and uneven. There were many mesas, or large rocks with flat tops. The Indians who lived in this region were farmers. They planted their crops on the tops of mesas....
Humans are returning to the moon—this time, to stay. Because our presence will be more permanent, NASA has selected a location that maximizes line-of-sight communication with Earth, solar visibility, and access to water ice: the Lunar South Pole (LSP). ...
The Assyrians are well known for their vast ancient empire in the Middle East; ancient cities, such as Nimrud and Nineveh; and their fierce invasions, including into the Kingdom of Judah and Egypt.
Science and technology, robotics and automation, have been eliminating the human component from the “jobs” market at an ever increasing rate for decades. And that is a good thing. Yes, there will always be tasks that humans must perform and which cannot be entrusted to machines alone, but...