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2019年2月9日 星期六

Daily Bulletin for 02/09/2019 

02/09/2019
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What Would a Multiverse Really Be Like?

Thomas Metcalf, Arc Digital

The idea of a multiverse is a thrilling concept which comes up in physics, philosophy, and fiction. But what would a multiverse really be like, and what would it mean for our existence?If a multiverse exists, then the world the totality of existence comprises more than one universe.

How Sex Killed Tyrannosaurus rex

Ross Pomeroy, RealClearScience

Tyrannosaurus rex, king of the tyrant lizards, may have been the most fearsome land predator to ever exist on planet Earth. Yet despite its lofty position and regal name, T. rex did not live a pampered, kingly lifestyle. True, no other dinosaur species directly predated upon T. rex after it reached the age of two, when an individual would have grown large enough to dissuade any would be attacker, but that doesn't mean that tyrannosaurs cruised through life, succumbing only to death from old age. In reality, life at the top was not a walk in the (Cretaceous) park.

The Silver Fox Study Still Shapes Thinking on Evolution

Lee Alan Dugatkin, Undark

Like many breakthroughs in science, Dmitri Belyaev's silver fox domestication experiment began with a thunderbolt: one simple, powerful, new idea. Born of a parish priest in early 20th century Russia, the geneticist proposed that all domestic animals were tamed through a generations-long process in which our distant ancestors repeatedly chose the calmest animals those that were friendliest to people for breeding.

Cell Death Processes Are Reversible

Charles Q. Choi, The Scientist

In 2007, Ho Man Holly Tang took a break from her undergraduate biology studies at Iowa State University to join her older brother, Ho Lam Hogan Tang, then a doctoral student at the Chinese University of Hong Kong, to work on a project together. In Ming-Chiu Fung's immunology lab, Hogan had been investigating how disturbances in the cytoskeletons of cells might contribute to the fragmentation of mitochondria during apoptosis, the most familiar form of cell suicide.

How Scientists Actually Dismantle a Nuclear Bomb

Benjamin Plackett, Inside Sci

There are enough nuclear weapons in the world to cause atomic Armageddon many times over, according to scientists, who estimate that no country could fire more than 100 nuclear warheads without wreaking such devastation that their own citizens back home would be killed.

'Young Blood' Transfusions Are Not Ready for Primetime

James Peyer, Leaps

The world of dementia research erupted into cheers when news of the first real victory in a clinical trial against Alzheimer's Disease in over a decade was revealed last October.Alzheimer's treatments have been famously difficult to develop; 99 percent of the 200-plus such clinical trials since 2000 have utterly failed. Even the few slight successes have failed to produce what is called disease modifying' agents that really help people with the disease.

Creating Video Games on Quantum Computers

Katia Moskvitch, Wired UK

When it comes to quantum programming, people think, Whoa, it's some weird, magical thing done by weird magical people'. And then I say, Well, I made battleships on a quantum computer'.James Wootton is excited. He always gets excited when it comes to quantum computing or game design but especially when he gets to do both.

Why Is There Almost No Antimatter in the Universe?

Ethan Siegel, Forbes

Think about these two seemingly contradictory facts:1.) Every interaction between particles that we've ever observed, at all energies, has never created or destroyed a single particle of matter without also creating or destroying an equal number of antimatter particles. The physical symmetry between matter and antimatter is even more stringent than this:

What the 'Meat Paradox' Reveals About Decision Making

Julia Shaw, BBC

Money changes our relationship with morality. The very existence of money, along with complex business and distribution channels, acts as a buffer between ourselves and the origin of our products. This can make us behave in ways that are deeply unethical.I can prove it to you. Do you think animal torture is evil? And do you also eat factory-farmed meat?

No Nuclear in the Green New Deal? Good.

Avery Thompson, Pop Mech

On Thursday, two Congressional Democrats, Representative Alexandria Ocasio-Cortez of New York and Senator Ed Markey of Massachusetts, unveiled a sweeping "Green New Deal" initiative to fight climate change and revitalize the economy. As part of that initiative, the Green New Deal calls for the entire country to be powered by renewable energy. While solar and wind energy are prominently featured, one power source is deliberately left out: nuclear.
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