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Автор abbu, Jul 25 2021 05:52 PM

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Сообщений в теме: 1902

#1901 KevinCax

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ГородBanepa

Отправлено 25 October 2024 - 06:14 AM

Sea robins are fish with ‘the wings of a bird and multiple legs like a crab’
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Some types of sea robins, a peculiar bottom-dwelling ocean fish, use taste bud-covered legs to sense and dig up prey along the seafloor, according to new research.

Sea robins are so adept at rooting out prey as they walk along the ocean floor on their six leglike appendages that other fish follow them around in the hope of snagging some freshly uncovered prey themselves, said the authors of two new studies published Thursday in the journal Current Biology.

David Kingsley, coauthor of both studies, first came across the fish in the summer of 2016 after giving a seminar at the Marine Biological Laboratory in Woods Hole, Massachusetts. Kingsley is the Rudy J. and Daphne Donohue Munzer Professor in the department of developmental biology at Stanford University’s School of Medicine.

Before leaving to catch a flight, Kingsley stopped at a small public aquarium, where he spied sea robins and their delicate fins, which resemble the feathery wings of a bird, as well as leglike appendages.

“The sea robins on display completely spun my head around because they had the body of a fish, the wings of a bird, and multiple legs like a crab,” Kingsley said in an email.
“I’d never seen a fish that looked like it was made of body parts from many different types of animals.”
Kingsley and his colleagues decided to study sea robins in a lab setting, uncovering a wealth of surprises, including the differences between sea robin species and the genetics responsible for their unusual traits, such as leglike fins that have evolved so that they largely function as sensory organs.

The findings of the study team’s new research show how evolution leads to complex adaptations in specific environments, such as the ability of sea robins to be able to “taste” prey using their quickly scurrying and highly sensitive appendages.

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#1902 FrancishEs

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ГородGray Mountain

Отправлено 25 October 2024 - 08:43 AM

What this high school senior wants adults to know about classroom phone bans
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When my friends and I walked into homeroom on the first day of school this year, my teacher told all of us to put our phones in a black plastic box on an old desk by the classroom door.

Handing over our phones during class is an official school policy, and my teachers always make this announcement at the beginning of the school year. But teachers would usually forget about the box by third period on the first day, never to be mentioned again by the second day of school. This year, however, the policy stuck that entire first day — and every day since.
I asked my Latin teacher why the school was suddenly getting so strict on phones. It turns out that over the summer most of the teachers had read social psychologist Jonathan Haidt’s book “The Anxious Generation: How the Great Rewiring of Childhood Is Causing an Epidemic of Mental Illness.”

Haidt, the Thomas Cooley Professor of Ehtical Leadership at New York University Stern School of Business, argues that a phone-based childhood leads to mentally unhealthy kids who are unprepared for life and, in my Latin teacher’s words, it “really freaked us out.” Teachers were serious about taking our phones now.

It’s not just causing trouble at my school. Some 72% of public high school teachers in the United States say that cell phone distraction among their students is a major problem, according to a study published by the Pew Research Center in April. In high schools that already have cell phone policies, 60% of teachers say that the policies are very or somewhat difficult to enforce, the same study reported.

Several states have passed laws attempting to restrict cell phone use in schools, and California Gov. Gavin Newsom recently signed legislation requiring school districts to regulate cell phone use. At least seven of the 20 largest school districts in the nation have either banned phones during the school day or plan to do so.

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#1903 Daisyjelay

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Отправлено Сегодня, 14:25 PM

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