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כתבות אחרונות מאתר 'Phys'
Phys

Manakins' dazzling dances may owe their origins to an ancient diet shift‎

Few animals put on a show quite like manakins. In the rainforests of Central and South America, males of these small tropical birds, with strikingly bright plumage, often gather at communal display sites (leks), where they clear their own dance courts and spend much of their lives performing high-speed backflips, snapping their wings like firecrackers, and running through choreographed routines with other males, all to attract a mate.

22:11
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Phys

Plant diversity may explain why some caterpillars are fussy about their food‎

Many insects will eat almost anything in their sight, such as certain beetles, grasshoppers and locusts, while others are remarkably picky eaters. For example, numerous insect herbivores will feed only on a single plant family or a specific type of tree. But why is this so?

21:33
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Phys

The hidden physics complicating interstellar lightsails‎

If we're to reach another star, chemical propulsion will not get us there in any reasonable time frame. We're going to need a different propulsion technology, and one of the most promising seems to be a solar sail. These giant reflective surfaces form the basis of many interstellar mission concepts. Combined with giant lasers pushing them, they can be accelerated to speeds unreachable by any other current technologies.

21:05
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Phys

Canary Island relics offer new clues into how North African cultures adapted to ocean living‎

Archaeological evidence from the Canary Islands suggests that by the 11th century, people there were harvesting and processing a variety of fish and other marine organisms—indicating that coastal resources may have played a vital role in the economic system, according to a study published in PLOS One by Jonathan Santana of the University of Las Palmas de Gran Canaria in Spain, and colleagues.

21:05
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Phys

A 5.3-million‑year‑old whale graveyard has been found on the floor of the Indian Ocean‎

When a whale dies, a very special natural phenomenon can come alive. The carcass might float at the surface for some time, attracting sharks and other predators. As it becomes weathered, it may start to sink, falling through the water until it eventually settles on the seafloor, where deep-sea scavengers feast upon it.

20:15
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Phys

Burned as waste for years, this overlooked plant material is poised to reshape how nylon gets made‎

Most people have seen nylon listed as a material on their clothing tags, but nylon is used in an array of other products, too, including automotive parts, wire insulation and medical supplies. Unfortunately, one of the building blocks of nylon, adipic acid, is produced from petroleum-derived benzene through energy-intensive processes and has a rather high carbon footprint. However, there may be a better way to produce this ubiquitous polymer.

19:46
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Phys

Researchers publish first complete connectome of fruit fly brain and 'spinal cord'‎

In a first, a large, international team led by multiple labs at Harvard Medical School and Princeton University has published a complete wiring diagram of all the connections between neurons in the central nervous system of an adult fruit fly.

19:03
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Phys

Research reveals how parenting styles influence children's honesty‎

Parents who come down hard on their children for telling lies or misbehaving may believe they are teaching the child right from wrong. But new research by NUS suggests that overly strict or punitive parenting could be part of what drives the behavior in the first place.

19:03
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Phys

Rare 500-year-old freeze-dried potatoes unearthed at Inca coastal site‎

Archaeologists digging at an Inca site on the arid coast of southern Peru have unearthed two rare, roughly 500-year-old freeze-dried potatoes. The potatoes are among the only ones found in more than a century and would have been transported across the empire from the freezing peaks of the Andes.

18:26
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Phys

Standard tests do not always detect all gluten residues in barley beer‎

Some barley beers labeled "gluten-free" contain small amounts of gluten residues that may trigger celiac disease but are not detected by the standard antibody-based tests currently in use, according to a study by the Leibniz Institute for Food Systems Biology at the Technical University of Munich. In the study, researchers compared two antibody-based testing methods with a mass spectrometric detection method newly developed at the institute. The results show that modern food analytical methods could help further improve the safety of gluten-free products in the future. The study is published in Applied Food Research.

17:37
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