But for a chatbot to pass itself off as a human agent, more than ten times this number of conversations will be needed, says Mr Carpenter.

ECONOMIST: Monitor: Call and response | The

Their answers are monitored, with any unusual physiological responses passed on to "a human field agent" who then subjects them to "a more careful interview process, " said CBP spokesman Bill Brooks.

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The Environmental Protection Agency has classified secondhand smoke as a known human cancer-causing agent.

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Kosan is also working with the National Cancer Institute to test analogues of geldanamycin, a bacteria-derived agent, in early human trials that may boost the effectiveness of chemotherapy.

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Some 300, 000 liquid doses of the antiviral agent Tamiflu for children were ordered by Health and Human Services Secretary Kathleen Sebelius and are to be delivered over the coming week, Schuchat said.

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The hormone was prepared from human pituitary glands recovered from cadavers, and the absence of rigorous collection guidelines and purification procedures permitted contamination of the formulated drug with the agent that causes Creutzfeldt-Jacob disease, the human equivalent of "mad-cow disease, " or bovine spongiform encephalopathy (BSE).

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A. wrongly accused of being a double agent and held for three years in total isolation (no reading material, no news, no human contact except with interrogators) in a closet-size concrete cell near Williamsburg, Virginia, made chess sets from threads and a calendar from lint (only to have them discovered and swept away).

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