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How does Tech Synergy work: two advances, payment, and cubes?

You buy two advances with one action and pay the normal cost for both. In a category where you have no cubes you can buy two as long as the first is the category's top advance. The designer's reply and a community answer indicate the cubes come from the supply rather than the Event track. A once-per-turn bonus (like free Spirituality science) applies only to the first, which is a community reading.

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