A new smartphone app allows users to set a time limit on the life of text messages. Any message sent using TigerText — which got its name before the Tiger Woods scandal — can be deleted from the phone of the both the sender AND the recipient, as long as both are using Tiger Text. What’s more, the messages never pass through carriers systems,

Guest: TigerText founder Jeffrey Evans

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Scientists at NASA’s Ames Research Center have developed a prototype device designed to plug into an iPhone, for the purpose of detecting harmful chemicals in the air. The gadget, which will be retrofitted for other smart phones, contains sensors for sniffing ammonia, chloride, hydrazine, formaldehyde and other potentially harmful substances. The long-term goal is to turn cell phone users into a vast threat detection network.

Guest: Jing Li, NASA

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