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Chemical propulsion is obsolete to go anywhere other than the moon. Three days - that's acceptable. But for Mars, we need propulsion technologies to get us there in, say, 60 days - then spend whatever length of time we want to spend and return when we want to come home.

Chemicals are not currently tested for their endocrine disruption potential before they are approved for use and enter our environment, and there are endocrine disruptors in a vast array of products we come into contact with every day, including organochlorine pesticides, plastics, fuels, and other industrial chemicals.

Chemistry cannot be manufactured or forced, so Wild Flag was not a sure thing, it was a 'maybe,' a 'possibility.' But after a handful of practice sessions, spread out over a period of months, I think we all realized that we could be greater than the sum of our parts.