濮阳东方医院技术很权威(濮阳市东方医院口碑非常高) (今日更新中)

If you're interested in fish who are scary-looking, poisonous and chock-full of elaborate defense mechanisms, look no further than the stonefish, a genus of fish that populate coastal waters of the Indo-Pacific region.As if their deadly venom and spiny exteriors weren't enough, scientists at the University of Kansas have found that stonefish also have a hidden switchblade on their face that they can flick out whenever they feel like they're in danger.Scientists call the bony, blade-like protrusion a "lachrymal saber," because it is located on a bone under the fish's eyes. Also, "lachrymal saber" is just a really metal-sounding name.William Leo Smith, associate curator and associate professor of ecology & evolutionary biology at KU, first started to understand how the lachrymal saber worked 15 years ago, when he was dissecting a stonefish he kept as a pet.This is a game-changerHe tells CNN the mechanism isn't just a cool new discovery (although it's that, too). It also changes the scientific understandings and classifications of this particular type of fish."It opens up these ideas of ecological questions. Muscular systems, bone systems, nervous systems all came together to form this. What led to its evolution or use?In other words, he says, "Why do we see this accumulation of so many horrible things on one fish?"The lachrymal saber is housed inside the fish's head, and they use their cheek muscles to deploy it. Though some stonefish are venomous, the saber is not.It could be a sex thing, tooSmith says he and his fellow researchers have reason to believe the saber isn't just for warding off predators: It could be a sex thing, too."There is evidence pushing towards that," he says. "They may use this in battles with other members of their species, like ram horns. It may also be involved in courtship behaviors."Oh, and the sabers glow."It's fluorescent green," Smith says. Since stonefish rely on camouflage for both protection and hunting prey, Smith doesn't think the fluorescence has a defensive purpose like, say, warning off predators.There are 134 described species of stonefish, and by Smith's observation, all of them have some form of lachrymal saber.  2202

In advance of hurricane season, Florida Power and Light is reviewing plans to make sure power is restored quickly after a storm. This week the company is holding its annual storm drill, simulating a Category 3 hurricane. During the drill, the company says it is incorporating lessons learned from Hurricane Irma, which knocked out power to 6.7 million electrical customers, according to the U.S. Energy Information Administration (EIA).EIA reports the rate of electric service restoration following Hurricane Irma was faster than Hurricane Wilma in 2005. Five days after Irma’s landfall, the share of customers without power had fallen from a peak of 64 percent down to 18 percent -- a recovery rate of about 9 percent of customers per day.Power outages during Wilma declined from 36 percent of customers to 16 percent by the fifth day after landfall. This is an average recovery rate of about 4 percent of customers per day. FPL credits the improvement to money spent on infrastructure improvements. Since 2006, more than 860 main power lines were hardened; within the next five to seven years FPL wants to harden all of them.Strengthened power lines perform approximately 40 percent better than non-strengthened lines, FPL said.This year, FPL plans to undertake the following additional initiatives to improve the reliabilityof service: 1416

Important update regarding early 2021 U.S. sailings. pic.twitter.com/Dra9jpXgCj— Carnival Cruise Line (@CarnivalCruise) November 18, 2020 145

How do astronauts go to the bathroom? It’s a question children have wondered for years, and now NASA wants help creating a better way.In a statement posted on their website, NASA is calling on the entire world to submit design concepts for compact toilets that can operate in both microgravity and lunar gravity.NASA is preparing to return to the Moon by 2024 as part of project Artemis, and as they upgrade other aspects of the flight, they are seeking new ideas for toilet facilities when astronauts are in the cabin and out of their spacesuits.Specially-designed toilets exist on the International Space Station already, however according to NASA, they were designed for microgravity only.NASA and HeroX are offering financial and merchandise rewards for winning design concepts in this Lunar Loo contest.Details about how to enter the contest can be found here. 873

I watched with horror this week as USAID distributed taxpayer funded documents claiming “we cannot tell someone’s sex or gender by looking at them” and that not calling oneself “cis-gendered” is a microagression I’m not cis-anything. I’m a woman.— Merritt Corrigan (@MerrittCorrigan) August 3, 2020 306

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