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125,172 articles from ScienceDaily

Dog domestication during ice age

Analysis of Paleolithic-era teeth from a 28,500-year-old fossil site in the Czech Republic provides supporting evidence for two groups of canids -- one dog-like and the other wolf-like - with differing diets, which is consistent with the early domestication of dogs.

A new way to assess male fertility

Current tests for male fertility include measuring the concentration and motility of spermatozoa. However, other characteristics of sperm, such as their ability to follow a chemical trail to the egg, can influence the likelihood of fertilization. Now, researchers have devised a quick and convenient microfluidic chip to assess this chemotactic response of spermatozoa, which could help provide a...

'Flapping wings' powered by the sun

In ancient Greek mythology, Icarus' wax wings melted when he dared to fly too close to the sun. Now, researchers have made artificial wings that are actually powered by the sun. The tiny wings, which can flap even faster than those of butterflies, could someday be used in robots or devices for solar energy harvesting, the researchers say.

Cobalt supply can meet demand for electric vehicle and electronics batteries

Greater use of electric vehicles might be good for the environment, but further growth hinges on continued availability of critical battery components such as cobalt. Cell phones and other electronics also depend on the element's availability. Supplies of the metal are adequate in the short term, but shortages could develop down the road if refining and recycling aren't ramped up or made more...

Highly sensitive sensors show promise in enhancing human touch

People rely on a highly tuned sense of touch to manipulate objects, but injuries to the skin and the simple act of wearing gloves can impair this ability. Scientists report the development of a new tactile-enhancement system based on a highly sensitive sensor. The sensor has remarkable sensitivity, allowing the wearer to detect the light brush of a feather. This crack-based sensor was inspired by...

Unexpected insights into the dynamic structure of mitochondria

As power plants and energy stores, mitochondria are essential components of almost all cells in plants, fungi and animals. Until now, it has been assumed that these functions underlie a static structure of mitochondrial membranes. Researchers have now discovered that the inner membranes of mitochondria are not static, but constantly change their structure every few seconds in living cells.

Creating custom light using 2D materials

Making artificial structures that emit light tailored to our specific needs is an even more attractive proposition. However, light emission in a semi-conductor only occurs when certain conditions are met. Researchers have discovered an entire class of two-dimensional materials that are the thickness of one or a few atoms. When combined together, these atomically thin crystals are capable of...


TUESDAY 18. FEBRUARY 2020


How too much fluoride causes defects in tooth enamel

Exposing teeth to excessive fluoride alters calcium signaling, mitochondrial function, and gene expression in the cells forming tooth enamel -- a novel explanation for how dental fluorosis, a condition caused by overexposure to fluoride during childhood, arises.

Rules of life: From a pond to the beyond

Researchers have conducted experiments in the nutrient-poor Cuatro Cienegas Basin in Mexico. Their goal was to shed light on how fundamental features of an organism's genome -- its size, the way it encodes information, and the density of information -- affect its ability to thrive in an extreme environment.