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Oldest fossilized dinosaur vomit discovered in Germany

Popular Science

Breakthroughs, discoveries, and DIY tips sent six days a week. Approximately 290 million years ago, a carnivorous dinosaur stomping around present-day Germany had a tummy ache. The Paleozoic predator eventually vomited up its stomach contents, and then hopefully continued to live its best dino life. Unlike most ancient regurgitated meals, this particular mixture of half-eaten prey and digestive bacteria successfully fossilized into what's known as a regurgitalite. In 2021, paleontologists discovered the extremely rare find while working in the famous Bromacker Permian dig site, about 155 miles southwest of Berlin.


Cleveland's beloved ancient sea monster was more turtle than shark

Popular Science

Science Biology Evolution Cleveland's beloved ancient sea monster was more turtle than shark Paleontologists revised the anatomy of Dunkleosteus terrelli-and it's still terrifying. Breakthroughs, discoveries, and DIY tips sent every weekday. About 360 million years ago, present-day Cleveland was home to a fearsome predator . But this giant did not stalk prey on land. Covered in armor plates and featuring scalpel-sharp, bone blades for teeth, was an undisputed, ancient apex predator.


He Hunted Alleged Groomers on Roblox. Then the Company Banned Him

WIRED

YouTuber "Schlep built a huge following tracking down alleged child predators on Roblox before being kicked off. The platform is facing multiple lawsuits over child safety. Last month, Kentucky attorney general Russell Coleman announced the details of yet another lawsuit against Roblox over suspected pedophiles lurking on the hugely popular gaming platform. While doing so, Coleman singled out the work of one self-described "predator hunter" who claims to have helped identify alleged abusers mixing with young gamers. "Roblox is even trying to silence those who raised these security risks," Coleman said. "The famous case of one of their developers, Schlep, immediately comes to mind." Schlep is in fact Michael, a 22-year-old Texan who has spent the last two years working with a group of other Roblox players to track down and identify people purportedly seeking to groom young children on the platform--predators like the one Schlep says allegedly groomed him a decade ago, which he says led ...




A Additional details for experiment presented in Section 3 Motivation We trained each agent i with online Q-learning [ 33 ] on the Q

Neural Information Processing Systems

The Boltzmann temperature is fixed to 1 and we set the learning rate to 0.05 and the discount factor to 0.99. To maximize their return, agents must therefore spread out and cover all landmarks. We use a discount factor γ of 0 .95 Since policies' hidden layers are of size 128 the corresponding value for During training, a policy is evaluated on a set of 10 different episodes every 100 learning steps. TeamReg is outperformed by all other algorithms when considering average return across agents.


Decapitated fish fossils depict Late Jurassic food chain

Popular Science

'Aspidorhynchus' was an efficient predator-but sometimes they became the prey. Breakthroughs, discoveries, and DIY tips sent every weekday. An unusual type of fossilized fish can be found within the limestone of present-day Germany. The Late Jurassic era conditions exhibited at the famed Solnhofen deposits have preserved the remains of multiple marlin-like marine predators known as . But these carnivorous remains aren't complete specimens--they're decapitated heads still attached to gastrointestinal tracts.



A Environmental Settings

Neural Information Processing Systems

They need to occupy 7 landmarks with size of 0.05. And the acceleration of agents is 0.7. Each predator is only allowed to communicate with three closest predators. The team reward is similar for both tasks. In cooperative navigation and predator prey, our model is trained based on MADDPG.