What is happening in Mariupol, the Ukrainian city under Russian siege?

Third, sound is a vibration that travels through a medium, like a gas, a liquid or a solid object. A sound's source is an object that moves or changes shape very rapidly. For example, if you strike a bell, the bell vibrates in the air. As one side of the bell moves out, it pushes the air molecules next to it, increasing the pressure in that region of the air. This area of higher pressure is a compression. As the side of the bell moves back in, it pulls the molecules apart, creating a lower-pressure region called a rarefaction. The bell then repeats the process, creating a repeating series of compressions and rarefactions. Each repetition is one wavelength of the sound wave. The sound wave travels as the moving molecules push. Pull the molecules around them. Each molecule moves the one next to it in turn. Without this movement of molecules, the sound could not travel, which is why there is no sound in a vacuum.|The development of visual object tracking has continued for decades. Recent years, as the wide accessibility of the low-cost RGBD sensors, the task of visual object tracking on RGB-D videos has drawn much attention. Compared to conventional RGB-only tracking, the RGB-D videos can provide more information that facilitates objecting tracking in some complicated scenarios. The goal of this review is to summarize the relative knowledge of the research filed of RGB-D tracking. To be specific, we will generalize the related RGB-D tracking benchmarking datasets as well as the corresponding performance measurements. Besides, the existing RGB-D tracking methods are summarized in the paper. Moreover, we discuss the possible future direction in the field of RGB-D tracking. Visual object tracking, as a fundamental research topic in computer vision and pattern recognition, aims to automatically predict the state of an object of interest in each frame of a video. Conventional visual object tracking mainly focus on RGB videos captured by a monocular camera. Thus, video object detection (VOD) aims to detect all objects given a video clip. Previous video object detection approaches mainly leverage temporal information in two different manners. These methods usually apply a still-image detector to obtain detection results, then associate the results. Specifically, they mainly improve features of the current frame by aggregating that of adjacent frames or entire clips to boost the detection performance via specific operator design. In this way, the problems such as motion blur, part occlusion, and fast appearance change can be well solved. However, these works still need sophisticated designs. Thus, it is in desperate need to build a simple yet effective VOD framework in a fully end-to-end manner. CNN-based detectors. However, given a video clip, such static detectors cannot handle motion blur, part occlusion, video defocus, or rare poses well due to the lack of temporal information, which will be shown in the experiment part. So if you're one of the people considering burning down a 5G to stop COVID-19 and its awful effects, you can put down the matches, thank you. Because it's such a new technology, we really have no idea what sort of effects it may have on human physiology, and even animals and plants, too, due to the roughly 800,000 new antenna sites that will be necessary to create sufficient 5G coverage throughout the country. The concern is that maybe we humans don't quite yet understand the long-term effects of RF (radio frequency) radiation, which you can more simply call "radio waves." Ultra-high-frequency radio waves really can zap your DNA and cause major health problems. But cellphone signals fall into the non-ionizing category of radiation. Still, it's unsettling to see that a $30 million study conducted by the U.S. To date, the NTP and U.S. Environmental Protection Agency have yet to classify 5G as potentially dangerous. However, around the world, some researchers are noting greater prevalence of tumors affecting the neck and head. You notice that the fish that were so calming have beat a hasty exit; it's now just you, the other divers and the looming shadows circling ever closer. Five blacktip reef sharks swim into your view, and your heartbeat, so calm only a moment ago, is raging in your ears as the sharks slowly weave themselves among your group of divers. Their movement is smooth and fluid, so you know they are at ease with you and the other humans, and they seem curious about these visitors to their home. You are diving with sharks, an activity that's quickly becoming popular with more than just the thrill seekers. In fact, diving with sharks has become a massive business around the world. In the following pages, we'll see the different ways you can dive with sharks, what sorts of sharks you might find and the dangers that come along with submerging yourself with these predators of the deep. Read on to find out about most popular way to dive with sharks: cage diving. Well water is fundamentally different, right down to where it comes from, how it tastes, and even the laws that apply to its quality and safety. Here are six things to know about well water. Municipal water supplies are maintained to supply ceaseless water, so long as there are no disasters. So are private wells. But there are circumstances when wells fail. Phil Ash, founder of Pro Paint Corner, where he works with many home contractors. This doesn't happen often, but it does when tremendous volumes are pumped out for extended periods of time. If you push the limits of your supply, the water may eventually start to look muddy and dark. The good news is that properly maintained wells generally work well for decades without any major issues. In order to find water, you dig or drill for it, accessing aquifers (a layer of permeable rock containing water). 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