Last turn, we were offered the technologies of Amphibious Warfare, Automobile, and Flight. The latter of the two techs will cancel out two of our wonders. Automobile will cancel out the effects of Leonardo's Workshop, and Flight will cancel out the effects of the Colosuss. What should we get have cancel out, one, both, or none? I recommend waiting to get Automobile as the Colossus is virtually replaced by SETI, but Leo's is irrecplacable and many of our units still get free upgrades.