World's oldest artwork discovered in Indonesian cave
It may not look like much—just a flaking image of three people around a big red pig.
It may not look like much—just a flaking image of three people around a big red pig.
Archaeology
Jul 3, 2024
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593
Two athletes square off for an intense dance battle. The DJ starts spinning tunes, and the athletes begin twisting, spinning and seemingly defying gravity, respectfully watching each other and taking turns showing off their ...
Other
Jun 13, 2024
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1
The good news is that—statistically speaking—there is reason to believe Edmonton Oilers goalie Stuart Skinner will improve against the Florida Panthers in the Stanley Cup final.
Mathematics
Jun 13, 2024
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18
In a May 15 paper released in the journal Physical Review Letters, Virginia Tech physicists revealed a microscopic phenomenon that could greatly improve the performance of soft devices, such as agile flexible robots or microscopic ...
Condensed Matter
May 18, 2024
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79
COVID-19 upended almost every aspect of daily life, including consumer and retailer behavior. However, it was not the first pandemic that changed how we shop.
Social Sciences
May 7, 2024
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5
A new fabrication process for helical metal nanoparticles provides a simpler, cheaper way to rapidly produce a material essential for biomedical and optical devices, according to a study by University of Michigan researchers.
Nanophysics
Mar 18, 2024
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169
This Hubble Picture of the Week features a richness of spiral galaxies: the large, prominent spiral galaxy on the right side of the image is NGC 1356; the two apparently smaller spiral galaxies flanking it are LEDA 467699 ...
Astronomy
Dec 29, 2023
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113
A multi-institutional team of anthropologists has discovered that two pieces of ancient Scythian leather excavated at sites in Ukraine were made from human skin. In their project, reported on the open-access site PLOS ONE, ...
When Merriam-Webster announced that its word of the year for 2023 was "authentic," it did so with over a month to go in the calendar year.
Social Sciences
Nov 28, 2023
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1
Chiral molecules can have dramatically different functional properties while sharing identical chemical formulae and almost identical structures. The molecular structure of two types of a chiral molecule—so-called enantiomers—are ...
Analytical Chemistry
Nov 16, 2023
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6
A hand (med./lat.: manus, pl. manūs) is a prehensile, multi-fingered extremity located at the end of an arm or forelimb of primates such as humans, chimpanzees, monkeys, and lemurs. A few other vertebrates such as the koala (which has two opposable thumbs on each "hand" and fingerprints remarkably similar to human fingerprints) are often described as having either "hands" or "paws" on their front limbs.
Hands are the chief organs for physically manipulating the environment, used for both gross motor skills (such as grasping a large object) and fine motor skills (such as picking up a small pebble). The fingertips contain some of the densest areas of nerve endings on the body, are the richest source of tactile feedback, and have the greatest positioning capability of the body; thus the sense of touch is intimately associated with hands. Like other paired organs (eyes, feet, legs), each hand is dominantly controlled by the opposing brain hemisphere, so that handedness, or the preferred hand choice for single-handed activities such as writing with a pen, reflects individual brain functioning.
Some evolutionary anatomists use the term hand to refer to the appendage of digits on the forelimb more generally — for example, in the context of whether the three digits of the bird hand involved the same homologous loss of two digits as in the dinosaur hand.
The hand has 27 bones, 14 of which are the phalanges (proximal, medial, and distal) of the fingers. The metacarpal is the bone that connects the fingers and the wrist. Each human hand has 5 metacarpals.
This text uses material from Wikipedia, licensed under CC BY-SA