But carbon-14 dating won't work on dinosaur bones. The half-life of carbon-14 is only 5,730 years, so carbon-14 dating is only effective on samples that are less than 50,000 years old. Dinosaur bones, on the other hand, are millions of years old -- some fossils are billions of years old. To determine the ages of these specimens, scientists need an isotope with a very long half-life. Some of the isotopes used for this purpose are uranium-238, uranium-235 and potassium-40, each of which has a half-life of more than a million years. Unfortunately, these elements don't exist in dinosaur fossils themselves. Each of them typically exists in igneous rock, or rock made from cooled magma. Fossils, however, form in sedimentary rock -- sediment quickly covers a dinosaur's body, and the sediment and the bones gradually turn into rock. But this sediment doesn't typically include the necessary isotopes in measurable amounts. Fossils can't form in the igneous rock that usually does contain the isotopes.|We present a dataset that contains object annotations with unique object identities (IDs) for the High Efficiency Video Coding (HEVC) v1 Common Test Conditions (CTC) sequences. Ground-truth annotations for 13 sequences were prepared. Released as the dataset called SFU-HW-Tracks-v1. For each video frame, ground truth annotations include object class ID, object ID, and bounding box location and its dimensions. The dataset can be used to evaluate object tracking performance on uncompressed video sequences and study the relationship between video compression and object tracking. In order to study their relationship, one must have task-relevant labels on raw (uncompressed) images and video. Currently, there is a lack of such datasets, especially for video. This made it possible for object detection models to be trained. Tested on HEVC CTC video sequences using labels provided in SFU-HW-Objects-v1. However, it is not possible to train or test object tracking models on annotations in SFU-HW-Objects-v1, because there are no object identifiers in in that dataset.
In 1763, a British army general ordered that blankets used on smallpox patients be sent to American Indian tribes. British Revolutionary War troops would also infect themselves with traces of smallpox, rendering themselves immune, in hopes of passing the disease along to the enemy. During World War I, Germans infected livestock headed for the Allies with anthrax. Even though the attack proved to be unsuccessful, it led to the creation of the Geneva Protocol in 1925. This prohibited the use of biological and chemical agents during wartime, while allowing research and development of these agents to continue. The British and German armies may have dabbled in biological warfare, but the Japanese went full steam ahead in the years that preceded World War II. Hundreds of thousands of Chinese civilians were killed by biological means at the hands of the Japanese army. One of these attacks included dropping paper bags containing plague-infested fleas from low-flying airplanes.
You can also select a time range by date. Access to certain historical data with varying time frame. Back testing is used when you are testing various trading strategies or systems. You just simply apply the strategies to a certain time period from the historical data. See how it performs against the market movement during that time. While this method is good to a certain degree, rely on it too much have caused the fall of many traders. The reason is they tested their strategies with historical data. Keep altered it so it can be a profitable strategy in that time frame. Most of the time, these tester will forget to test their modified strategy in current market condition. This is not a wise decision; a strategy that works well in 2001 but fail at the current condition is as good as trash. If you have tested your strategy against historical data and it score good winning trades, create a demo account and test it again in the current market condition; If it still works and building steady profits in at least two months, you already have a strategy that works.
The High Altitude Water Cherenkov (HAWC) observatory is a very high energy gamma-ray detector located in Mexico. In late 2018, the HAWC collaboration completed a major upgrade consisting of the addition of a sparse outrigger array of 345 small water Cherenkov detectors (WCDs) surrounding the 300 WCDs of the main array and extending the instrumented area by a factor of 4. It provides an improved reconstruction of the showers whose core and footprint are not well contained in the array and increases the effective area in the range of a few TeV to beyond 100 TeV. This improvement in sensitivity will help to have a better understanding of the Galactic sources that accelerate particles up to the knee of the cosmic ray spectrum. In this contribution, we will show the current status, the performance, and the first results from the HAWC outrigger array. The High Altitude Water Cherenkov (HAWC) is a very-high-energy gamma-ray observatory located at 4100 m altitude on the volcano Sierra Negra in the state of Puebla in central Mexico.|Webcams are versatile devices. Whether you’re making your own YouTube videos, setting up a surveillance system, conducting online meetings or using it for another home or office purpose, having the right webcam makes all the difference. Before you buy one, take into account how you’ll use it most of the time. Then, look for a webcam that meets your needs. The main factors to consider include resolution - look for a cam that delivers at least 720p, but preferably 1080p. Frame rate is another important consideration; look for a webcam that delivers at least 30 frames per second. An integrated microphone, sleek design and a lens that automatically adjusts for optimal lighting and focus are also important. There’s a variety of great options out there. We’ve compiled a list of 10 of the best webcams on the market to help you choose the one that’s best for your needs. This solid mid-range option works well for most users.
An image of a preproduction non-line-of-sight cannon in development by BAE Systems. In previous and current wars, the shells fired by U.S. Army rear artillery missed too many targets, caused too much collateral damage (like the deaths of civilians), and failed to explode properly. This tidbit becomes less surprising, though, when one learns that in the 21st century, the U.S. Army still used manned tanks based on designs created in the 1950s and '60s. There were periodic updates as new technology emerged, but this essentially amounted to adding new bells and whistles to an old component. It will represent the first complete ground-up rebuild of mobile artillery technology in decades. Line-of-sight weapons require fairly close proximity to the enemy, beyond-line-of-sight much less. The cannon being developed by BAE Systems for the U.S. Army uses a 155mm .38 caliber howitzer. Allows for a wide choice of ordinance. 38 caliber howitzer. Allows for a wide choice of ordinance. One group, termed smart submunitions, are the type of cluster bombs described in the run-in on the previous page.|We boarded the train heading for Lviv, in the northwest corner of Ukraine, near the Polish border and the NATO front lines, expecting to find it crowded with people fleeing before a feared Russian invasion. But a day after Russian troops moved into eastern Ukraine, and tens of thousands more stood ready to sweep into the country, there were no lines of people clamoring for tickets at the station Tuesday, no people with jam-packed bags stuffed with precious valuables suggesting they were planning to leave for good. On the train, in conversations during a seven-hour ride on a 330-mile journey, Emile Ducke, a photographer and translator traveling with me, and I talked to passengers making the journey west to Lviv, often for complicated reasons, many struggling to grasp that what they were seeing was actually happening. Anna Maklakova, 22, does not dismiss the idea that a war is possible. For much of her life, since she was 14, there has been a smoldering conflict against Russian-backed separatists in the Donbas region of eastern Ukraine.
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Carolyn Hax: Buying a house feels like ‘the end of all adventure’
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