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20－Snake Poison
lijiao 197
19－The Stuff of Dreams
lijiao 306
18－Porpoises
lijiao 201
17－A Man-made Disease
lijiao 591
16－The Modern City
lijiao 356
15－Secrecy in Industry
lijiao 700
14－The Butterfly Effect
lijiao 225
13－The Search for Oil
lijiao 208
12－Banks and Their Customers
lijiao 159
11－How to Grow Old
lijiao 211
10－Silicon Valley
lijiao 224
09－Royal Espionage
lijiao 161
08－Trading Standards
lijiao 210
07－Bats
lijiao 262
06－The Sporting Spirit
lijiao 229
05－Youth
lijiao 240
04－Seeing Hands
lijiao 191
03－Matterhorn Man
lijiao 453
02－Spare That Spider
lijiao 437
01－Finding Fossil Man
lijiao 648