In this task, you will be presented with a context passage, a question about that paragraph, and a possible answer to that question. The task is to check the validity of the answer. Answer with "Yes" or "No".

The bar was manned by an expensive humanoid robot. It turned toward Sarah's wave and acknowledged her with a nod, moments later setting a fluted glass of sparkling liquid in front of her. I marveled at the robot's smoothness and coordination. Clearly, it was a high-end model. Sarah transferred the glass to my free hand and pulled me away from the bar for more introductions, with Alexis trailing after us. I spent the evening listening, mostly. Listening and stuffing my face with all the bits of fine food provided. No one minded; Sarah's inner circle was content to fill our circle of couches with plenty of chatter. Ray, a plump man who was grey where he wasn't bald. Zheng, short and dark and lean, with a very intense gaze. He made me a little uncomfortable. Kishori, petite, her hair strung out in a series of braids that reached nearly to her waist. I categorized them based on their appearances, hoping I'd be able to pick them out of the crowd again later. Most of their chatter was meaningless to mestories of day-to-day activities, how so-and-so had been seen in so-and-so's table at lunch and my wasn't that a surprise, and why hadn't the chef concocted this delectable a selection of appetizers for the dance the other night, but of course those rolled meat pastries reminded one of the pastries back on Earth, didn't they, and this was somehow an interesting fact. After the first half-hour, I stopped expending effort to keep names and stories and gossip straight. I wasn't learning anything useful. I could have started asking questions, but I wanted to get my bearings first. Tonight was for observation. I didn't bother trying to seek out a different group of potentially more interesting people, though. They all looked the same: clusters of social butterflies surrounded by the less apt, the hangers-on, the circle with whom the gossip was shared. <sep>Who are two members of Sarah's inner circle?<sep>Zheng
Yes

General relativity includes a dynamical spacetime, so it is difficult to see how to identify the conserved energy and momentum. Noether's theorem allows these quantities to be determined from a Lagrangian with translation invariance, but general covariance makes translation invariance into something of a gauge symmetry. The energy and momentum derived within general relativity by Noether's presecriptions do not make a real tensor for this reason. Einstein argued that this is true for fundamental reasons, because the gravitational field could be made to vanish by a choice of coordinates. He maintained that the non-covariant energy momentum pseudotensor was in fact the best description of the energy momentum distribution in a gravitational field. This approach has been echoed by Lev Landau and Evgeny Lifshitz, and others, and has become standard. The use of non-covariant objects like pseudotensors was heavily criticized in 1917 by Erwin Schrodinger and others. <sep>When did the standard approach to energy momentum become criticized?<sep>1911
Yes

Littlefoot 's grandfather one night tells the children a story about '' The Lone Dinosaur '' , a legendary longneck who once protected the Great Valley from the most ferocious sharptooth ever to live . A fight ensued , which led to the Sharptooth 's death . However , the sharptooth left '' The Lone Dinosaur '' with a scar slashed across his right eye . Soon after the battle , a huge monolith that resembled a proud sauropod , having life-sized Sharptooth teeth arranged around his neck , came out of the ground during an earthquake . The dinosaurs called it '' Saurus Rock '' . The legend also states that if anyone damages the monolith , bad luck would descend upon the valley . A few days later when the kids are playing , Littlefoot accidentally falls off a cliff . Just before he hits the ground , a gruff Diplodocus rescues him . This longneck introduces himself only as '' Doc '' and gives no knowledge of his history . Littlefoot is intrigued by this newcomer , who is scarred across one eye and displays prior knowledge of the Great Valley 's topography . For the preceding reasons , Littlefoot assumes that Doc is the Lone Dinosaur . He tells his friends this , narrating an apparently extemporaneous legend to support his assumption . Inspired , Cera 's infant nieces , the twins Dinah and Dana , go to Saurus Rock without anyone noticing . Later when the friends are playing , they notice that Dinah and Dana are missing . Recalling their talk of the day before , they go to Saurus Rock to find them . <sep>Why does Littlefoot and his friends think the twins went to Saurus Rock?<sep>Because they always go there
No