济南上、下颌骨教学(山西人体解剖模型-感觉系统) (今日更新中)

Colt, the manufacturer of the AR-15 rifle, has announced it's exiting the consumer rifle market as demand for high-powered, semi-automatic guns wanes.The consumer market for rifles has "experienced significant excess manufacturing capacity" and there's too much supply of AR-15 guns on the market to justify making more, the company 345

CAVE CITY, Ark. — A man who was 11 years old when he and a friend shot and killed four students and a teacher at their Arkansas middle school was killed in a crash Saturday.Drew Grant, who legally changed his name from Andrew Golden, died around 9 p.m. Saturday after a head-on collision near Cave City, Arkansas, 326

Eleven people have died so far in 2019 while climbing Mount Everest, a behemoth of a mountain that towers 29, 029 feet above sea level. This is more than twice the number of people who died climbing Everest in 2018, which saw only five deaths that season.But it's not the number of deaths that some may find shocking — it's the reasons behind them. Only two of this season's Mount Everest deaths can be attributed to falls.So what's killing climbers ascending the mountain? It's primarily exhaustion and altitude sickness, and something called "the death zone."Seasoned climbers call any part of the mountain above 26,000 feet "the death zone" because there is only so long a human can survive at that elevation due to lack of oxygen. "Even when using bottled oxygen, supplemental oxygen, there's only a very few number of hours that we can actually survive up there before our bodies start to shut down," mountain guide Adrian Ballinger told CNN. And, unfortunately, the wait at the summit of Mount Everest plays a role in these deaths because the longer someone is at that altitude, the more severe they feel the effects from lack of oxygen and exhaustion. During the week beginning May 20, crowds of climbers became stuck in a queue to the summit. When this happens, climbers aren't eating, drinking or sleeping and continue to use up vital oxygen, which can lead to death.British climber Robin Haynes Fisher was one of those who had warned of the dangers of overcrowding."With a single route to the summit, delays caused by overcrowding could prove fatal so I am hopeful my decision to go for the 25th will mean fewer people. Unless of course everyone else plays the same waiting game," he wrote in a captioned Instagram post on May 19.He died after suffering from what appeared to be altitude sickness at 28,215 feet, while returning from the summit on Saturday.Altitude sickness occurs when people are at high elevations for an extended period of time. It can happen anywhere that's 8,000 feet above sea level or more. There are three types of altitude sickness. From least to most severe, they are: acute mountain sickness, high-altitude pulmonary edema (HAPE) and high-altitude cerebral edema (HACE). The symptoms for all three types are similar (headache, fatigue, dizziness, nausea, vomiting, shortness of breath), but HAPE is accompanied by a buildup of fluid in the lungs and HACE, the most severe type of altitude sickness, occurs when there's a buildup of fluid in the brain.So how can climbers avoid the same deadly fate as the 11 who died? Simply put — be careful. Acclimate as slowly as you can to increased elevations, drinks tons of water, rest and immediately start descending if you feel symptoms of altitude sickness.CNN contributed to this story. 2782

Customs and Border Protection will begin to take down the administration's border wall prototypes in the San Diego area today, according to a CBP official."At this point, we have learned a lot from them, but we don't necessarily have a purpose or use for them anymore, and we will be bringing them down," said the official.In April 2017, CBP awarded contracts 372

Despite the rise of streaming services like Netflix, going to the movies is still a billion dollar business in America. COVID-19 has closed the doors of theaters across the nation, but as things start to reopen, some theaters are prepping for incoming changes.The Ruth Sokolof Theater in Omaha was getting ready for a busy summer, but thanks to the pandemic they were dealt a plot twist. “Our priority is and will continue to be reopening when it’s safe and appropriate to do so,” said Casey Logan, Deputy Director of Film Streams.Their doors have been shut since early March, and with so many seats close together, things will definitely look different when the show goes on.“A checkerboard style seating where there’s groups of seating all with six feet or more apart so that there is that distance between groups in the theaters,” said Logan.He says certain events like one-time screenings with a visiting filmmaker that brings hundreds of people won’t be presented the same or maybe, not at all. “We’re just expected that there would be events that in normal times that we would be presenting that we won’t be able to present in the months ahead,” said Logan.Limited crowd size and social distancing are the two big changes, but there’s other things theaters should consider.“You don’t give the same seat to two consecutive shows and in-between screenings you have to somehow sanitize the theater,” said Dr. Phani Tej Adidam, Chair & Professor of Marketing of Entrepreneurship at UNO.He adds moviegoers should be part of a loyalty program for contact tracing purposes.“If something happens they should have the ability to trace all the people who came in and all the people they were in contact with,” said Adidam.Theaters may struggle with content as well, as summer blockbusters continue to be delayed. Logan says it may take time, but he’s confident the industry will bounce back.“I think people miss that experience of coming to cinemas, we’re certainly hearing from a lot of people that are looking forward to the day when we reopen so that they can have those experiences again,” said Logan.He also says changes to concessions will also be important to limit person to person interaction, and that buying tickets online before the show, is something movie goers should take advantage of. 2313

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