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Scenes of chaos erupted at Hong Kong's airport on Tuesday evening as riot police clashed with protesters who continued to block security gates at one of the world's largest travel hubs.The police made their first significant appearance at the airport since protests began there five days ago, with at least five police buses arriving at the airport after 10:30 p.m.Protestors scrambled to set up barricades as police officers left the buses and entered the airport. Riot police appeared soon after, amassing outside the airport terminal and clashing with demonstrators.The violence came after Hong Kong's Airport Authority announced that all check-in services would be suspended for another night, due to terminal operations being "seriously disrupted.""Members of the public are advised not to come to the airport," the authority said in a statement. All outbound flights which have not yet completed the check-in process have been canceled. 954

Several days after Sacramento County declined to bring charges against two police officers who shot and killed Stephon Clark last year in his grandmother's backyard, California's top prosecutor announced a similar decision.Police said they fired at Clark because they believed he was pointing a gun at them, but only a cellphone was found at the scene.State Attorney General Xavier Becerra said Tuesday that his office conducted its own investigation and could not find evidence the officers acted illegally."There's a young man who's no longer alive, with two sons who won't have a father, whose mother I just met with, who's grieving. Of course it was a tough call They're all tough calls. It's never easy," he told reporters. "But we have to do the job before us."The fatal shooting and the decisions of authorities not to charge the officers have prompted protests in the California capital.Dozens of demonstrators bearing photos of Clark and holding Black Lives Matter signs were arrested Monday night. A total of 84 people were arrested and cited, police said.Sacramento Police Capt. Norm Leong, who live-tweeted the protest, said the arrests were for unlawful assembly. He also said that 1207

Spending 340 days aboard the International Space Station between 2015 and 2016 caused changes in astronaut Scott Kelly's body, from his weight down to his genes, according to the results of the NASA Twins Study, released Thursday.The majority of changes that occurred in Kelly's body, compared with his identical brother, Mark, on Earth, returned to normal once he came back from the space station. The study results suggest that human health can be "mostly sustained" for a year in space, the researchers said.On a call with reporters Thursday, Mark thanked Scott for his service to the country and commitment to science by spending a year in space without knowing how it would affect him."I got all the glory, and you got all the work," Scott said, chiding his twin."And I got people coming to my house for tubes of blood," Mark replied in reference to the scientific samples taken during Scott's mission; Scott was collecting the same samples from himself to send back to researchers on Earth.The results show "the resilience and robustness of the human body," said Steven Platts, deputy chief scientist for NASA's Human Research Program, which coordinated the study.Coincidentally, the results are being released just in time for the 58th anniversary of the first manned spaceflight by Soviet cosmonaut Yuri Gagarin.But the much-anticipated study reveals areas that may require countermeasures or safeguards when preparing for longer space missions or missions to deep space, like Mars.The molecular, physiological and behavioral changes were divided into low-, mid-level and high-risk groups. Scott's change in body mass and microbiome were considered low-risk. Shifts in collagen regulation and blood vessel fluid management were mid-level, and genomic instability was regarded as potentially high-risk."When we go into space and experience microgravity and travel at speeds like 17,500 miles an hour, our bodies adapt and continue to function and, by and large, function extremely well," Platts said.The study, which includes the work of 84 scientists who made up 10 teams from 12 universities in eight states, all studying different aspects of the human body in space, was published Thursday in the journal 2227

San Francisco is on course to become the first US city to effectively ban the sale of e-cigarettes once its board of supervisors votes on Tuesday.The board is expected to pass an 191

So you've heard of a blood moon, and maybe even a blue moon, but what about a black moon?The phenomenon is occurring again in North America on July 31 -- the first one since 2016. The rest of the world will have to wait until August 30.But, what does this even mean? Why is it important? Here's everything you need to know about this astronomical event.Wait, what is black moon?A black moon is basically the second 427

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