Before takeoff

first_imgThe return of the American robin to back yards across the country is a lovely sign of coming spring. But the little songbird with the orange-red breast and bright blue eggs has some not-so-lovely relatives: the crocodile and the alligator.The connection was made during a riveting lecture, “What Art Thou, Little Bird? Developmental Mechanisms for the Origin and Evolution of Birds” by Arkhat Abzhanov, associate professor of organismic and evolutionary biology, on Jan. 31 at the Harvard Museum of Natural History’s Geological Lecture Hall.The talk, introduced by Jane Pickering, executive director of the Harvard Museums of Science and Culture, kicked off the five-part series “Evolution Matters,” made possible by a gift from Drs. Herman and Joan Suit.Abzhanov is an expert in cranio-facial evolutionary development, and a pioneer in the field of evolutionary developmental biology (“evo-devo”). He’s been interested in birds since childhood, and Nature named his work on beak development one of the top evolutionary discoveries of the last decade. Abzhanov began his talk by pointing out that humans have long observed and portrayed birds in everything from prehistoric cave paintings to religions, fairy tales, and computer games.But what makes a bird?The taxonomic group Archosauria, Abzhanov explained, includes dinosaurs, crocodiles, and birds.Abzhanov said birds’ feathers evolved from scales, and their wings evolved from the five-fingered hands and agile wrists of early reptiles. Birds’ beaks are used variously — to catch fish, shrimp, and bugs; to crack open nuts; to make nests — with shapes and sizes that depend on the bird, and its evolution.Beaks, along with wings and the ability to fly, Abzhanov said, make birds extremely successful and diverse. There are 29 orders and 10,000 species, making it the largest group of land vertebrates.In Abzhanov’s research, after identifying the molecules that control the shape the beak takes (long and good for drinking nectar, for example, or short and strong and good for cracking nuts), using the chicken embryo, he successfully made molecular changes that forced the expression of particular genes. Through that manipulation, Abzhanov was able to make a chicken’s beak grow much bigger.“When and how the molecules are used determine the bird,” he explained.Abzhanov showed a slide with an image of an alligator embryo, which looked strikingly similar to the image of a chicken embryo next to it.And while it’s been 75 million years since birds lost their teeth, to this day mutant chickens will grow teeth — teeth that bear a close resemblance to their ancient and remarkably close relative, the alligator.“I think [birds] developed gradually, step by step and piecemeal,”Abzhanov said.Abzhanov noted that fossils tell of some birdlike dinosaurs with plumage that didn’t fly; the Tyrannosaurus rex, he said, probably had big fluffy feathers as a juvenile. And as the audience gasped, chuckled, and murmured over the idea, the lecture ended.“Evolution Matters” continues at the Harvard Museum of Natural History at 6 p.m. Feb. 12 with “Looking for Signs of Evolution: Bees, Butterflies, and Bacteria.”last_img read more

UW-Madison police chief bans ‘Thin Blue Line’ imagery

first_imgMADISON, Wis. (AP) — University of Wisconsin-Madison’s police chief has banned officers from using “Thin Blue Line” imagery while on duty. The move by Chief Kristen Roman follows criticism on social media of a “Thin Blue Line” flag displayed at the police department’s office. The flag, which resembles a U.S. flag but has a blue stripe, is considered a sign of police solidarity, but has also been criticized as a symbol of white supremacy. The Wisconsin State Journal reports that Roman says the flag has been “co-opted” by extremists with “hateful ideologies” and that her department needs to distance itself from the imagery to build trust with the community.last_img

Gyms allowed to reopen Monday ; Phase One businesses 50% capacity

first_imgFlorida heads into a “full phase one” reopening starting Monday, says @GovRonDeSantis. That includes restaurants and retail at 50% capacity, museums and libraries 50%, gyms and fitness centers can reopen with social distancing.— Forrest Saunders (@FBSaunders) May 15, 2020 During a press conference on Friday, Governor Ron DeSantis reported that all of Florida will be able to head into a full phase one on Monday.Gyms, fitness centers, museums, and libraries will all be allowed to reopen so long as proper social distancing measures are in place and are being followed. During the conference, the Governor stated that COVID-19 is a respiratory illness that attacks the immune system of those who are not in good health and in good physical shape. He expressed that opening the gyms would give residents the opportunity to get into better shape and a better chance at fighting the virus so long as social distancing and sanitary measures are being followed:“Make sure that you respect the social distancing capacity,” DeSantis said. “If you’re sweating on the dip bar, clean the dip bar if you’re done doing dips.”He also said that outdoor training would be good options for gyms with the capability to do so, and would lessen the chances of spread.In addition to gyms and museums reopening on Monday, the Governor also stated that restaurants and retail establishments will be allowed to operate at 50% of their capacity.last_img read more