Problem: (CNN) -- Jo-Wilfried Tsonga ended Roger Federer's hopes of winning a record-equaling seventh Wimbledon title on Wednesday as the French 12th seed staged a stunning fightback to reach the semifinals. Federer appeared to be cruising into the last four after winning the first two sets, but Tsonga inflicted the Swiss world No. 3's first defeat from that vantage point in 179 grand slam matches. It was only the third time in the 29-year-old's glittering career that the 16-time grand slam champion had surrendered a two-set lead. Tsonga, ranked 19th in the world, triumphed 3-6 6-7 (3-7) 6-4 6-4 6-4 on Centre Court, serving out to love as he earned a clash with second seed Novak Djokovic. The Serbian, who beat Tsonga in the 2008 Australian Open final, ended the dream run of Australian 18-year-old Bernard Tomic. Tsonga defeated Federer for just the second time in six meetings, their first on grass. "It was amazing. I played unbelievable. It's never easy to come back against Roger. I'm so happy, it's crazy," the 26-year-old told reporters after reaching the semifinals at Wimbledon for the first time. "He's the biggest champion in the sport. He has achieved so much and is the best player in the world. To be two sets down and come back was unbelievable. I served really well. Against Djokovic I will have to come out and do the same again." Federer has now lost in the quarterfinals two years in a row, being beaten by eventual runner-up Tomas Berdych in 2010. "Jo played great. Really from start to finish I don't remember seeing a break point after I broke him in the first game," Federer said.

Question: "What two players beat Federer in the quarterfinals?"

Answer: "Tomas Berdych"
Answer: yes

Problem: Allan crouched over his desk once more, pen in hand and mind blank. He contemplated a story, an outline he had laboriously constructed some time ago. He had filled his pen and raised it, the nib descending towards the paper, before the sound came: the gentle, persistent tapping of the gnarled, primeval willow touching the window with long, insistent fingers. His eyes awoke with a passionate, determined flame, though the only light came from the glutted moon. Allan filled page after page, the words escaping from his mind onto the paper. Where before they had marched in regiments, practiced in ranks and followed their leaders' commands, the words now escaped in their true forms, unhindered by any stricture. He continued long into the night, until the eldritch orb had sunk into the waiting hands of the willow, raised perpetually skyward. Arthur looked up from the results of a night's frenzied labors and looked Allan in the eye. "What is this?" he queried, indicating the pages he held in his left hand. "I decided that since I wasn't having much success with more traditional stories, I might see what sort of work I produced if I let my imagination go freely," Allan replied, somewhat less self-assured than he had been the previous night. "What in G-d's name could have possessed you to do such a thing," cried Arthur, nearly raising his voice. "After all I said the day before, why have you abandoned centuries of literary progress for some self-indulgent fantasy?" He shook the papers at Allan, raising them like a belt above the head of a disobedient son. "This is nothing but a glorified Grimm's tale, a miscarried child of Stoker, a creation less fit to be published than to be told around an open fire at the hovel of some peasant!" He spoke the last word with such heavy intonation that Allan shrank back before the physical wave of sound emanating from Arthur's throat. "Do you hate the modern system of literature? Do you personally despise the works the Enlightenment or the progress made since Shakespeare?" For a moment, Allan could hardly do more than shake his head. "No, of course not I " "Then why," Arthur barreled on, "do you disregard them all and return to this superstitious babble, this morbid, paganistic drivel?

Question: "What does Arthur think of Allan's non-traditional stories?"

Answer: "They are inventive"
Answer: no

Problem: You might want to know how cold it is. You may need to know how fast the wind is blowing. Maybe it rained last night? Do you know how much? Does it feel humid to you? You have heard all these questions before. To answer these questions, we need data. That data comes from special tools. These tools collect data about the weather. You can see some of the common tools listed below: A thermometer measures temperature. An anemometer measures wind speed. A rain gauge measures the amount of rain. A hygrometer measures humidity. A wind vane shows wind direction. A snow gauge measures the amount of snow.

Question: "What are some common tools?"

Answer: "Thermometer"
Answer:
yes