"Because a fact seems strange to you, you conclude that it is not one. ... All science, however, commences by being strange. Science is successive. It goes from one wonder to another. It mounts by a ladder. The science of to-day would seem extravagant to the science of a former time. Ptolemy would believe Newton mad."

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What we need to do first is to find out how big the migration problem is and what the economic consequences of it are for the United States and Mexico. We hear a lot of extravagant numbers and claims made, but very few hard facts. We don't really know what, if any, burdens illegal migrants impose on the US economy or the social welfare apparatus, and those issues must be clarified.

— Ernesto Zedillo