Abstract
Statistics concerning background characteristics of a remarkable group of 292 youths who reason extremely well mathematically are presented. Identified initially at age 12 or less, they reside all over the United States and in two foreign countries. The sex ratio is 12 boys per 1 girl. The group tends to be quite able verbally, but much more so mathematically. Most of their parents are well educated. Some of these young students are vastly more accelerated in school grade placement than are the majority of the group. Other relevant characteristics are also discussed.

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