<Policy_ImprovementYieldChanges>
<Row>
<PolicyType>POLICY_FREE_THOUGHT</PolicyType>
<ImprovementType>IMPROVEMENT_TRADING_POST</ImprovementType>
<YieldType>YIELD_SCIENCE</YieldType>
[B]<Yield>1</Yield>
[/B] </Row>
From Civ5Policies.XML
Code:<Policy_ImprovementYieldChanges> <Row> <PolicyType>POLICY_FREE_THOUGHT</PolicyType> <ImprovementType>IMPROVEMENT_TRADING_POST</ImprovementType> <YieldType>YIELD_SCIENCE</YieldType> [B]<Yield>1</Yield> [/B] </Row>
So... is it wrong in the manual / Civilopedia, or a bug? I'll flag it as possible.