YeounHo Jo

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사이언스온 - 중력파 대체 어떻게 검출했나?...‘라이고’ 원리 따라잡기

[9] 소리와 빛의 메아리에서 중력파 관측까지<p>» 중력파를 검출한 거대 검출장치 라이고(LIGO). 출처/ LIGO과학협력단<p><b>미</b>국 시각으로 2월 11일 오전, 세계 과학계를 들썩이게 한 굵직한 과학 소식이 있었다. 이론적으로 알려진 지 무려 100년여 만에 중력파를 실험적으로 관측했다는 소식이었다.[1] 13억 광년 떨어진 지점에서 벌어진, 두 블랙홀의 충돌에서 유발된 ‘시공간의 출렁임’인 중력파가 지구에 도달한 것을 관측한 현대 과학기술의 쾌거였다.<p>중력파라는 시공간의 출렁임이 퍼져나가다 지구를 관통해 지나가면, 지구 위에서는 …

Climate Change May Make Transatlantic Flights Longer, More Expensive

Climate change could impact transatlantic travel, making westbound flights longer and costing airlines an extra $22 million per year in fuel — which will likely lead to higher ticket prices for travelers.<p>A study published Wednesday in the journal Environmental Research Letters says that jet stream …

Why North Korea's satellite launch is troubling

<b>(CNN) —</b> Pyongyang celebrated with fireworks, and a North Korean government spokesman dismissed international efforts to block the successful launch of the country's second satellite as nothing more than a "puppy barking at the moon." Grandiosity, provocation and defiance clearly remain the key …

South Korean workers leave Kaesong industrial park

<b>(CNN) —</b> Hundreds of workers from South Korea have been repatriated from an industrial complex in North Korea just north of the border separating the two Koreas.<p>The South Korean Unification Ministry said Thursday that 280 workers who had been stationed at the Kaesong industrial complex had crossed …

Gravitational waves detected -- and that's creating waves in science

<b>(CNN) —</b> Einstein was right.<p>Just over 100 years after he published his general theory of relativity, scientists have found what Albert Einstein predicted as part of the theory: gravitational waves.<p>"We have detected gravitational waves. We did it," said David Reitze, executive director of LIGO, the …

Gravitational Waves

Caffeine Doesn't Give You Heart Palpitations, Study Finds

Drinking coffee, tea or chocolate does not appear to cause heart palpitations, heart fluttering and other out-of-sync heartbeat patterns, researchers reported Tuesday.<p>The report challenges a widely held belief that caffeinated drinks cause irregular heart rhythms that can lead to heart failure or …

Why people get more stupid in a crowd

The “wisdom of crowds” doesn’t always apply – sometimes group-think nudges people to make wrong-headed decisions.<p>The downstairs room of a central London pub is not where most psychologists would choose to stage an experiment in decision-making, but for Daniel Richardson it is ideal. A researcher at …

Critical Thinking

Barack Obama: Guns Are Our Shared Responsibility

THE epidemic of gun violence in our country is a crisis. Gun deaths and injuries constitute one of the greatest threats to public health and to the safety of the American people. Every year, more than 30,000 Americans have their lives cut short by guns. Suicides. Domestic violence. Gang shootouts. …

Guns

Jean Paul Gaultier on France's fashion rebels - CNN Style

Written by Jean Paul Gaultier<p>In October 2015, Balmain creative director Olivier Rousteing joined CNN Style as guest editor. He commissioned a series of features on the theme of #diversity, exploring issues around fashion, politics, gender, family, race and culture.<p>I didn't go to fashion school. …