NASA’s arsenic biology discovery slammed

The uncertainty of science! A microbiologist is slamming last week’s NASA discovery that claimed a microbe had incorporated arsenic instead of phosphorus as part of its DNA. Key quote:

In an interview Monday, Redfield said the methods used by the researchers were so crude that any arsenic they detected was likely from contamination. There is no indication that the researchers purified the DNA to remove arsenic that might have been sticking to the outside of the DNA or the gel the DNA was embedded in, she added. Normally, purifying the DNA is a standard step, Redfield said: “It’s a kit, it costs $2, it takes 10 minutes.” She also questioned why the researchers analyzed the DNA while it was still in the gel, making the results more difficult to interpret: “No molecular biologist would ever do that.”

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Falcon 9/Dragon launch likely delayed to at least Thursday

The Falcon 9/Dragon test launch is likely delayed to at least Thursday. Key quote:

During reviews of vehicle closeout photos this morning, engineers found a possible crack in the second stage engine nozzle. If the nozzle needs to be replaced, the first launch opportunity would be Friday or Saturday. Officials called “remote” a possibility that the problem could be resolved in time to fly Wednesday.

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