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More than a decade ago, Collins, a decorated scientist at Boston University, helped give birth to synthetic biology, which soon grew into arguably the world's hottest and most poorly defined scientific discipline. Its practitioners made big promises: that by harnessing the ideas of engineering and applying them to genetics, they would create cheap, abundant biofuels, customized medicine, even self-growing houses, as one scientist predicted.
The potential for mastering life was so exciting that scientists talked about applications decades away as if they were around the bend. Scholars from the Bay Area and Boston issued forth into industry, promising to reinvent life from the inside out, evolution be damned. Drawing inspiration from electrical circuits and computing, they'd create standardized biological parts. The notion drew easy comparisons to Legos: Snap them together, and soon enough you'd have control of life.
Since 2004 investors have poured at least $1.84-billion into synthetic-biology start-ups; the government has added many more millions in research dollars. But more recently, the hype has...