[00:02.76]Unit 33 Reading and speaking [00:06.39]How do you Know when someone is lying? [00:09.42]1 How the ancient Chinese did it [00:13.88]The Chinese used rice. [00:16.17]An examination for truthfulness [00:18.09]might go something like this: [00:20.24]"Is your surname Zhang?" [00:21.96](They know the guy's surname is,in fact,Zhang.) [00:25.04]"Yes." [00:26.75]The interrogators hand Mr Zhang some rice. [00:29.63]They have already counted the number [00:31.32]of rice grains. [00:33.25]"OK. Put this handful of rice in your mouth. [00:36.41]Hold it for three seconds.Spit it out." [00:39.51]Then they count how may rice grains come out. [00:42.75]"Did you steal the chicken?" "No." [00:46.01]"OK.Put this handful of rice in your mouth. [00:49.34]Hold it for three seconds. Spit it out." [00:52.54]"Again, they knew how many grains went in, [00:55.26]and they count how many come out. [00:57.81]If more grains come out after the question [01:00.31]about the stolen chicken than came out [01:02.96]after the "easy" question, [01:04.96]where the suspect truthfully gave his name, [01:07.25]they know he's lying. [01:08.96]How? The stress of being caught [01:11.29]lying makes the suspect's mouth drier. [01:14.19]Fewer grains stick. [01:16.63]More come out Mr Zhang stole the chicken. [01:19.94]

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