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LettersThis Week's LettersA comparison of DARPA and Bell Labs and the contributions of DARPA's Project Vela are presented. That Robert Louis Stevenson was depressed is questioned, but his long fingers may provide other insights to his medical history. The earliest printed star charts, published around 1094, are traced to China. An apparent contradiction, that isolated sister species can have similar niches yet sister species in the same area usually have different niches, is discussed. For the education of K-12 teachers, it is suggested that, "although a [college] major in a content area is not necessary for someone to be a teacher, it is vital if he or she is going to be a good teacher." And how long the Sahara region has been a desert is clarified.
Letters in This Issue
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
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