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KATHERINE AULL's laboratory in Cambridge, Massachusetts, lacks a few mod cons. "Down here I have a thermocycler I bought on eBay for 59 bucks," she says, pulling out a large, box-shaped device she uses to copy short strands of DNA. "The rest is just home brew," she adds, pointing to a centrifuge made out of a power drill and plastic food container, and a styrofoam incubator warmed with a heating pad normally used in terrariums.

In fact, Aull's lab is a closet less than 1 square metre in size in the shared apartment she lives in. Yet amid the piles of clothes she recently concocted vials of an entirely new genetically modified organism.

Aull, who works as a synthetic biologist for a biotech company by day, created her home lab after hearing about a contest on the science fiction website io9.com for "mad scientists with homebrew closet labs, grassroots geneticists, and garage genome hackers".

After two months of tinkering, she engineered a microbe that she says is capable of performing simple logic operations, which could be the forerunner to basic biological computers. "Biology is wet, squishy and imprecise. It drives engineers insane," Aull says. "This would allow us to take the noise out of biology."