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Grade-school students in a northeastern Brazilian city are using uniforms embedded with computer chips that alert parents if they are cutting classes, the city's education secretary, Coriolano Moraes, said Thursday. Twenty-thousand students in 25 of Vitória da Conquista's 213 public schools started using T-shirts with chips this week, Mr. Moraes said. By 2013, all of the city's 43,000 public school students will be using them, he added. The chips send a text message to the cellphones of parents when their children enter the school or alert the parents if their children have not arrived 20 minutes after classes have begun. The city government invested $670,000 in the project, Mr. Moraes said.

"In recent years, researchers in the messy world of biology have been able to build systems that function like the clean, binary switches on computer chips-and we've covered a number of reports in this area. Unfortunately, most of these share a significant limitation: they rely on proteins from bacteria that act as switches to turn genes on and off under specific conditions. We know about only a limited number of these genetic switches, which may set a severe limit on the number of logical operations we can string together inside a cell."

Scientists at The Scripps Research Institute in California and the Technion - Israel Institute of Technology - have developed a "biological computer" made entirely from biomolecules that is capable of deciphering images encrypted on DNA chips.

A way to print Radio Frequency Identification (RFID) chips right onto paper has been discovered by a team of scientists from University of Montpellier.