Instructions: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Input: Mars thigh bone photo explained by NASA ... maybe (OK, definitely) 
  
 "No bones about it," says NASA, that supposed thigh bone discovered by the Mars Curiosity rover is just a rock. 
  
 The space agency killjoys – who easily could've just issued a "no comment" and kept chuckling to themselves in the Johnson Space Center breakroom while the believers keep believing – cleared up the whole mess by dropping some science on their skeptics. 
  
 "If life ever existed on Mars, scientists expect that it would be small simple life forms called microbes," NASA said on its Mars Science Laboratory website. "Mars likely never had enough oxygen in its atmosphere and elsewhere to support more complex organisms. Thus, large fossils are not likely. " 
  
 Or maybe that's just what they want us to think [cue the spooky "X-Files" music] ... 
  
 Check out the slideshow above for more curious finds found by the Mars Curiosity rover. 
  
 RELATED: Mystery lights over Houston keep people talking about UFOs ||||| A rock spotted by NASA's Curiosity rover on Mars may look like a femur bone, but is actually just a weathered Martian rock formation. 
  
 A photo from NASA's Curiosity rover on Mars set the Internet abuzz this week with claims that the robot had found a "thigh bone" on the Red Planet. But not so fast. That so-called bone? Just a weathered Martian rock, NASA says. 
  
 The erroneous bone claim first appeared on a UFO blog and was quickly picked up by media outlets. So much so, that NASA released Curiosity's "thigh bone" Mars rock photo with a science explanation on Thursday (Aug. 21). 
  
 In the photo description, NASA officials wrote that while "this Mars rock may look like a femur thigh bone," it is not the fossilized remains of a mysterious Martian. "Mission science team members think its shape is likely sculpted by erosion, either wind or water." 
  
 The Curiosity rover has found evidence that Mars was once a habitable place in the ancient past, but there is no evidence that creatures large enough to leave a bone behind ever existed on the planet. 
  
 "If life ever existed on Mars, scientists expect that it would be small simple life forms called microbes," NASA officials wrote in the photo description. "Mars likely never had enough oxygen in its atmosphere and elsewhere to support more complex organisms. Thus, large fossils are not likely." 
  
 There is a long tradition of seeing shapes in Mars rocks that don't reflect reality. The phenomenon in which the human brain perceives faces, animals or other shapes that aren't really there is known as pareidolia. 
  
 NASA's Curiosity rover — the centerpiece of NASA's $2.5 billion Mars Science Laboratory (MSL) mission — landed on Mars Aug. 5. How much do you know about Curiosity and its mission? Start the Quiz 0 of 10 questions complete 
  
 A 'Curiosity' Quiz: How Well Do You Know NASA's Newest Mars Rover? NASA's Curiosity rover — the centerpiece of NASA's $2.5 billion Mars Science Laboratory (MSL) mission — landed on Mars Aug. 5. How much do you know about Curiosity and its mission? 0 of questions complete 
  
 That Mars illusion history dates back to the late 1800s, when astronomers reported seeing canals on the Red Planet in telescope views. Then in 1976, a photo from NASA's Viking 1 orbiter revealed a formation that gained fame as the " Face on Mars ." Later observations by NASA and European spacecraft showed no face, just a large rock feature, proving the face was just a trick of shadow and light. 
  
 Since the "Face on Mars," photos from Mars orbiters and rovers have captured shapes resembling a lizard, a rat and even a jelly donut — all of them just illusions or strange rock formations on the Red Planet. 
  
 NASA's 1-ton Curiosity rover has been exploring Mars since its arrival in August 2012. 
  
 Email Tariq Malik at tmalik@space.com or follow him @tariqjmalik and Google+. Follow us @Spacedotcom, Facebook and Google+. Original article on Space.com. ||||| NASA/JPL-Caltech/MSSS 
  
 A newly published photo of Mars taken by NASA's Curiosity rover could send you racing to alert the local CSI crew. 
  
 An image caught by the rover's MastCam on August 14 shows a collection of rocks, half buried in dust. One in particular stands out. It looks quite a bit like a femur bone from a thigh. 
  
 This is all it takes to get alien fanatics excited about the possibility of fossilized alien remains on Mars. However, an alien femur on Mars is no more real than the uneaten jelly doughnut on the Red Planet or the infamous monument to Elvis. 
  
 NASA said Thursday its science team members expect that the rock was shaped through erosion caused by wind or water. NASA knows how images of odd objects can stir up the public imagination, so the space agency gives this preemptive statement: "If life ever existed on Mars, scientists expect that it would be small simple life forms called microbes. Mars likely never had enough oxygen in its atmosphere and elsewhere to support more complex organisms. Thus, large fossils are not likely." 
  
 The thigh-bone-looking rock actually looks different from a regular human femur. It's crooked, rather than straight, which only feeds the imagination when it comes to alien anatomy. Chalk this up to the human tendency to try to make sense out of random shapes. |||||
Output:
Sorry, ET lovers: That "fossilized thigh bone" spotted on Mars this week was really just (can you bear the tension) a rock, NASA says. "No bones about it!" writes the agency on its website. "Mission science team members think its shape is likely sculpted by erosion, either wind or water." The Houston Chronicle calls NASA scientists "space agency killjoys" for explaining that any life in Mars' history likely existed at the microbial level, owing to a lack of oxygen to support complex life forms. And CNET notes that the rock was too crooked to be a thigh bone anyway. But today's alien enthusiasts aren't the first to dream: Astronomers claimed to see canals on Mars in the 1800s, and fans interpreted a "face" amid the light-and-shadow play of a 1976 photo of the planet's surface, Space.com reports.