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Research shows that given 15 minutes of free play, four- and five-year-olds will spend a third of this time engaged in spatial, mathematical, and architectural activities.

研究表明，如果给定15分钟的自由玩耍时间，四到五岁的孩子会将其中三分之一的时间花在有关空间、数学和建筑的活动上。

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About forty percent of all eighteen to twenty-four-year-olds or almost eleven and a half million were in school in October of last year.

VOA: special.2009.11.19

What's particularly interesting is you get this effect easily with undergraduates but you also get it with four-year-olds and with monkeys.

但这个实验有一个很有趣的地方,在本科生中做这个实验，很容易就得出这个结果,而在四岁小孩和猴子中，同样能得到这个结果。

耶鲁公开课 - 心理学导论课程节选

Typically--I don't know for those particular children, but typically on those tasks three-year-olds and young four-year-olds tend to fail, and around the age of four or five kids tend to succeed.

我不太了解那些特定儿童的情况,但一般来讲,三岁和刚进入四岁的儿童,通常会在这些任务中失败,而四岁或是五岁左右的儿童则通常会成功

耶鲁公开课 - 心理学导论课程节选

Nearly 80% of enrollment is "just a transfer of income from the government to families of four year olds" who would have attended preschool anyway.

WSJ: Review & Outlook: Head Start for All

Among this group, only 28 percent of three-year-olds and 49 percent of four-year-olds were enrolled in 1996, and the latter figure is three percentage points lower than it was in 1991.

UNESCO: II Part Analytic Section

But today, fewer than 3 in 10 four year-olds are enrolled in a high-quality preschool program.

FORBES: Full Text: President Obama's 2013 State Of The Union Address