https://arab.news/w76b3
Driven by a profound love of shapes and symmetries, Donald Coxeter (1907–2003) preserved the tradition of classical geometry when it was under attack by influential mathematicians who promoted a more algebraic and austere approach.
His essential contributions include the famed Coxeter groups and Coxeter diagrams, tools developed through his deep understanding of mathematical symmetry.
Brain research has been accelerating rapidly in recent decades, but the translation of our many discoveries into treatments and cures for brain disorders has not happened as many expected.
We do not have cures for the vast majority of brain illnesses, from Alzheimer’s to depression, and many medications we do have to treat the brain are derived from drugs produced in the 1950s—before we knew much about the brain at all.
Tackling brain disorders is clearly one of the biggest challenges facing humanity today. What will it take to overcome it? Nicole Rust takes readers along on her personal journey to answer this question.
“The Atlas of Birds” captures the breathtaking diversity of birds, and illuminates their conservation status around the world.
Full-color maps show where birds are found, both by country and terrain, and reveal how an astounding variety of behavioral adaptations—from flight and feeding to nest building and song—have enabled them to thrive in virtually every habitat on Earth.
Maps of individual journeys and global flyways chart the amazing phenomenon of bird migration, while bird classification is explained using maps for each order and many key families.
Author: ERIN LIN
Over the course of the Vietnam War, the United States dropped 500,000 tonnes of bombs over Cambodia—more than the combined weight of every man, woman, and child in the country.
What began as a secret CIA infiltration of Laos eventually expanded into Cambodia and escalated into a nine-year war over the Ho Chi Minh trail fought primarily with bombs.
Fifty years after the last sortie, residents of rural Cambodia are still coping with the unexploded ordnance that covers their land. In “When the Bombs Stopped,” Erin Lin investigates the consequences of the US bombing campaign across post conflict Cambodia.
We see the last cookie in the box and think, can I take that? We reach a hand out. In the 2.1 seconds that this impulse travels through our brain, billions of neurons communicate with one another, sending blips of voltage through our sensory and motor regions.
Neuroscientists call these blips “spikes.” Spikes enable us to do everything: talk, eat, run, see, plan, and decide. In “The Spike,” Mark Humphries takes readers on the epic journey of a spike through a single, brief reaction.
When World War II ended, about 1 million people whom the Soviet Union claimed as its citizens were outside the borders of the USSR, mostly in the Western-occupied zones of Germany and Austria.
These “displaced persons,” or DPs—Russians, prewar Soviet citizens, and people from West Ukraine and the Baltic states forcibly incorporated into the Soviet Union in 1939—refused to repatriate to the Soviet Union despite its demands.
Thus began one of the first big conflicts of the Cold War. In “Lost Souls,” Sheila Fitzpatrick draws on new archival research, including Soviet interviews with hundreds of DPs, to offer a vivid account of this crisis, from the competitive maneuverings of politicians and diplomats to the everyday lives of DPs.
