Generate an explanation for the given claim using the provided supporting material from the paragraph. Please consider the following points while generating an output. 1) The claim will always have supporting proof in the paragraph, and the paragraph will have a clear point of view supporting the claim. 2) There can be instances where direct correlation to the claim is not available. Make use of the sentences in the paragraph to provide a corresponding output supporting the claim. 3) The explanation should be at least one and at most twelve sentences long.

Paragraph: Not applicable. The cost of olive oil is not in question. This story did the best job of the three stories we reviewed in quantifying the potential benefits observed in the study. "Over the next five to six years, those intensive users suffered strokes at a rate of 0.3 percent per year. That compared with just over 0.5 percent among non-users, and 0.4 percent among moderate users. When the researchers factored in other diet habits, exercise levels and major risk factors for stroke like high blood pressure and diabetes heavy olive oil use was tied to 41 percent reduction in the odds of stroke." There are better ways to try to communicate numbers of less than one percent. But we applaud the detail provided. Not applicable. Excellent. The story devoted almost 200 words to the potential limitations of such an observational study. Also a clear description of the cohort design. No disease-mongering of stroke in the story. The story included strong input from a researcher who wrote in an editorial on the study. The story at least mentioned other factors that could be at play "no single food is consumed in isolation, he points out in his editorial. Olive oil is one part of the Mediterranean diet that has been tied to heart benefits. The diet also boasts plenty of fruits and vegetables, legumes, whole grains, fish and moderate amounts of red wine." Not applicable. The availability of olive oil is not in question. The story attempted to put the new finding into the context of past research on olive oil and the Mediterranean diet. It's clear the story did not rely on a news release. Claim: Olive oil lovers show lower stroke risk
This story explored the nature of an observational study about the stroke-reducing risks of olive oil. The story appropriately discussed other possible reasons for the findings and why a clinical trial is stronger evidence. With so much news coverage touting an apparent benefit from olive oil in this study (CBS had a headline about "huge decline in stroke risk"), it is refreshing to see so much time and space given to a clear-eyed evaluation of the evidence as this story provided.

Paragraph: Analysis of powdered samples drilled out from inside an ancient and once water-soaked rock at the rover's Gale Crater landing site show clays, sulfates and other minerals that are all key to life, scientists told reporters at NASA headquarters in Washington and on a conference call on Tuesday. The water that once flowed through the area, known as Yellowknife Bay, was likely drinkable, said Curiosity's lead scientist John Grotzinger, who is with the California Institute of Technology. The analysis stopped short of a confirmation of organics, which are key to most Earth-like life. But with 17 months left in the rover's primary mission, scientists said they expect to delve further into that question. Science operations currently are suspended because of a computer glitch, which is expected to be resolved this week. Whether or not Mars has or ever had life, it should have at one time at least had organic compounds delivered to its surface by organic-rich comets and asteroids. Finding places where the organics could have been preserved, however, is a much trickier prospect than finding the environmental niches and chemistry needed to support life, scientists said. In May, following a one-month interruption of radio communications caused by the positions of Earth and Mars, scientists plan to drill a second hole into the Gale Crater rock to look for organic compounds. "If there was organic material there, it could have been preserved," said David Blake, principal investigator for Curiosity's Chemistry and Mineralogy, or CheMin, experiment. A lack of organics, however, would not rule out the Yellowknife Bay site as suitable for life, scientists added. "You don't have to have carbon present in a geological environment that's habitable in order to have microbial metabolism occur," Grotzinger said. Some micro-organisms on Earth, for example, can feed on inorganic compounds, such as what are found inside rocks. "There does need to be a source of carbon somewhere, but if it's just CO2 (carbon dioxide), you can have chemoautotrophic organisms that literally feed on rocks and they will metabolize and generate organic compounds based on that carbon," Grotzinger said. Analysis shows the Gale Crater rock contains carbon dioxide, in addition to hydrogen, oxygen, phosphorus, sulfur and nitrogen. Carbon dioxide provides a key ingredient in the building blocks for life, all of which have now been found in the Mars rock sample, Grotzinger said. The $2.5 billion, nuclear-powered Curiosity rover landed inside the giant Gale Crater impact basin, located near the Martian equator, on August 6 for a two-year mission. Scientists were drawn to the area because of a three-mile (5-km) mountain of sediment, called Mount Sharp, rising from the crater floor. But shortly after the rover's landing, the team decided to first explore the Yellowknife Bay area, located in the opposite direction from Mount Sharp. Observations from Mars orbiters showed three different types of terrain coming together in Yellowknife Bay, plus a low elevation, all hints that water could have once flowed and pooled on the surface. That hunch was verified with the first chemical analysis of material drilled out from inside what appears to be a slab of bedrock, named John Klein, after a mission manager who died in 2011. Scientists don't know the rock's age, nor how it formed. They suspect, however, that the John Klein rock is at least 3 billion years old and that it spent enough time in non-acidic and not-too-salty water for various telltale clays and minerals to form. "This rock, quite frankly, looks like a typical thing that we would get on Earth," Grotzinger said. "The key thing here is this is an environment that microbes could have lived in and maybe even prospered in." The habitable conditions in Yellowknife Bay appear to roughly coincide within a couple of hundred million years of the first evidence for life on Earth. "On Earth, finding organics in very, very ancient rocks is a difficult proposition," said Paul Mahaffy, principal investigator for Curiosity's Sample Analysis at Mars, or SAM, instrument. Finding organics on Mars may be even more challenging. Without much protection from an atmosphere, ultraviolet and cosmic radiation can destroy organics. Mars also apparently is covered with chemicals, known as perchlorates, that consume organics. "The search for organic carbon is an issue for this mission and you want to do this as deliberately as possible. You don't just want to wander around and try stuff out," Grotzinger said. Knowing that Mars at least had the ingredients for life, however, makes the search for organics more viable. "This is not a simple problem, but I think the mission is up to it and we're really excited to get started on that now," Grotzinger said. Claim: Mars had the right stuff for life, scientists find.
Seven months after NASA's rover Curiosity landed on Mars to assess if the planet most like Earth had the ingredients for life, scientists have their answer: Yes.

Paragraph: "Severe cold snaps followed by snowstorms and then another blast of cold. For many, this Wisconsin winter can't end soon enough. So when U.S. Rep. Mark Pocan, D-Madison, took to the floor of the House of Representatives on Jan. 16, 2014, a speech about global warming was the last thing many folks wanted to hear. Pocan, a member of the House's Safe Climate Caucus, spent his one-minute speech ticking off what he said were clear signs of climate change. This claim caught our attention: ""Ice fishermen are already noticing fewer days they can be out on our ice covered lakes."" It feels like Wisconsin has been frozen solid for months, and many folks wouldn't be surprised to see ice fishermen tromping around on Memorial Day. But Pocan's claim is about more than this winter. His statement is about long-term trends and what is driving them. Is he right about climate change and fewer days on ice-covered lakes? When we asked Pocan for backup for the claim, his staff pointed us to Climatewisconsin.org, a web site that highlights research and reports prepared by environmental groups. The site includes interactive features that focus on the two largest lakes in Madison -- Mendota and Monona. It includes the amount of time they have been covered by ice in past years. ""The records show significant year-to-year variability in the length of the ice-cover season, but there is a clear trend of fewer ice-cover days over time,"" the site says. ""Overall, the average number of days of ice cover on the Madison lakes has decreased by around 29-35 days over the past 150 years. Significantly, the longest ice seasons on record are all clustered in the first few years of the record, while most of the shortest seasons fall towards the end of the record."" The site also includes this statement, which is pretty similar to that made by Pocan: ""With climate change models predicting warmer temperatures, we can expect to see a trend towards fewer days of ice-covered lakes as each year passes. In fact, with the aid of a remarkable dataset from Madison's lakes, scientists infer that a change in ice duration has already taken place."" Information posted on the site comes, at least in part, from the work of John J. Magnuson, Emeritus Professor of Zoology and Limnology, who has been at UW since the late 1960s and helped found the UW-Madison Center for Limnology in the early 1980s. Limnology is the study of freshwater lakes, and the UW center says it's the birthplace of the field of study, dating back to the 1870s. Magnuson is an expert on the effects of climate change on freshwater lakes, and has published numerous academic papers on the effect of climate change on lakes and fish. In an interview, Magnuson said researchers around the world, including Canada, Finland, Sweden, Russia, Japan and Madison, have studied lake ice for years. Researchers note the day lakes freeze and the day the ice goes out. It's a more official version of what is waged in a less academic way by lakefront bars that stage ice-out guessing contests. Madison researchers have records for Mendota and Monona that go back to 1855. The long term trend for Lake Mendota is that, on average since 1855, there are 29 fewer days that the lake is covered with ice, according to Magnuson. Six of the shortest seasons for Mendota have been in the years since 1980. Five have been since 1995, including the two shortest seasons ever -- 21 days in the winter of 2001-02 and 47 days in 1997-98. Lake Monona has seen on average of 35 fewer ice-covered days, and also has seen a cluster of shorter seasons in recent years. ""The breakup of the ice is occurring, on average, two weeks earlier. And the freezing of the lakes have come two weeks later, on average,"" Magnuson said. ""The result is that four months of ice is reduced to about three months."" To be sure, Wisconsin has some 15,000 lakes, and we cannot check each one. ""This is highly variable with every water body having different characteristics, and is obviously very weather dependent as well,"" said Thomas Van Haren, of the state Department of Natural Resources Bureau of Law Enforcement. But it seems reasonable to focus on Lake Monona and Mendota given their size and because they are in Pocan's district. So what about this throwback winter? Magnuson said it's a statistical blip. Some years the ice stays around longer than others, but over time the trend has been toward shorter ice seasons. ""The variability is very high"" in terms of the length of the seasons, he said. ""Not only does lake ice respond to the warming climate, it also responds to local weather."" Lake Mendota iced over Dec. 16, 2013 -- about a month earlier than the previous year and four days earlier than the median date. Lake Monona froze Dec. 10, 2013, compared with Dec. 31 the previous year and a median date of Dec. 15. National Weather Service records from the weather office in Sullivan indicate this was the 9th coldest winter on record, so far, in Madison, and the coldest in 35 years. The average temperature was 15.8 degrees below normal. ""This is the sort of winter that's typical of 50 or 100 years ago,"" Magnuson said. Going global So what about the connection Pocan made between shorter ice fishing seasons and climate change? Magnuson said the shorter seasons are a symptom of global warming -- one consistent with many others, such as changed bird and butterfly migration patterns, plants that bloom earlier, and disappearing glaciers. ""We can't take this ice data and say 'therefore we say greenhouse gas is causing this,'"" he said. ""That's a question for the atmospheric physicists. Our data is consistent with what other people are finding, with the kind of things that atmospheric scientists are seeing from C02."" He added: ""There's abundant evidence that it's getting warmer and that spring is coming sooner."" Unfortunately, he's talking about long-term trends. Not what is going to happen this year. Our rating It's been a longer and colder winter than in recent years. But that doesn't erase a trend that's been well-established. The number of days that the lakes have ice on them -- making them safe for ice fishing -- has declined." Claim: "As a result of climate change, ice fishermen in Wisconsin ""are already noticing fewer days they can be out on our ice covered lakes."
It's been a longer and colder winter than in recent years. But that doesn't erase a trend that's been well-established. The number of days that the lakes have ice on them -- making them safe for ice fishing -- has declined.