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Rumors began to spread on the internet Saturday after an unnamed scientist working on the Phoenix Mission stated to Aviation Week & Space Technology, the White House had been briefed on "provocative and complex" information that NASA has yet to disclose to the public regarding the "potential for life on Mars." The scientist said that the announcement will be regarding the habitability of Mars rather than finding actual life. The scientist also said that the information had been excluded from the July 31 press conference.
NASA immediately denied those claims sending out a message on Twitter, a social networking and micro-blogging website which is used by NASA to communicate to the public in a style pretending that the Lander itself is talking to its readers, stating, "Heard about the recent news reports implying I may have found Martian life. Those reports are incorrect. Reports claiming there was a White House briefing are also untrue and incorrect." The Phoenix Lander, according to NASA, does not have the ability to detect life, past or present, but the Lander's MECA microscopy station could potentially 'see' bacteria in the soil, which NASA states have not been discovered.
"[The report of a White House briefing is] not true [and is] bogus". MECA results have not been discussed at the White House. There is no one who knows either on the [Phoenix] project in Tucson or at [NASA] HQ who knows where this information came from," said Peter Smith, the top investigator for the Phoenix Mission. Smith also added that MECA has "nothing new to report." 
The MECA or Microscopy, Electrochemistry and Conductivity Analyzer, is designed to analyze soil samples as small as 16 μm to determine the chemical composition of the sample. While the lander were unable to image any bacteria, Phoenix's MECA did detect potassium, magnesium and chloride, minerals that are necessary to create or sustain life. MECA also determined that the soil was acidic, which means it could support the growing of some plants from Earth like asparagus.
"We are attempting to assess the chemicals and minerals that make up the soil composition. We are now about half way through the process and there are several conflicting points of view. This is not a good time to go public with half the story," added Smith who also stated that "we are committed to following a rigorous scientific process. While we have not completed our process on these soil samples, we have very interesting intermediate results. Initial MECA analyses suggested Earth-like soil. Further analysis has revealed un-Earthlike aspects of the soil chemistry."
Despite the denials by NASA, some Internet observers maintain that NASA is still preparing for a major announcement.
"The reason that all this seems so hush-hush is due to a future paper and press release that appears likely to pop out of the American Association for the Advancement of Science (AAAS) and its Science magazine. Whatever the poop is from the scoop that’s been studied by Phoenix, that information is purportedly going through peer-review", said David Leonard for LifeScience.com.
NASA will hold a media teleconference today August 5, at 2:00 p.m. EDT, to discuss these recent science activities.

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NASA denies rumors of finding life on Mars