In Panek's new book, "The 4 Percent Universe" (Houghton Mifflin Harcourt, 2011), Panek recounts the story of how dark matter and dark energy were discovered.

在潘尼克的新书《4％的宇宙》（哈考特出版社，2011）中，潘尼克详述了暗物质与暗能量怎样发现的经过。

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And publisher Houghton Mifflin Harcourt Publishing Co. is expected to cut several hundred of its 5,300 full-time employees as part of a restructuring, a person familiar with the situation said.

知情人士称，作为重组计划的一部分，预计出版公司Houghton Mifflin Harcourt Publishing co .将在其5,300名全职员工中裁员数百人。

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Houghton Mifflin Harcourt, which developed the iPad algebra program in California, said it planned to compare the test scores of students using a textbook in digital and traditional book formats.

加州开发了iPad代数应用的霍顿·米夫林-哈考特宣称，其计划比较使用数字化教科书与传统课本的考试成绩。

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The New Geography of Jobs , Enrico Moretti, Houghton Mifflin Harcourt, 2012.

FORBES: Connect

Among publishers, Urdan thinks Pearson is the most likely bidder, with McGraw-Hill less likely, and Houghton Mifflin Harcourt least likely, since it is private-equity backed.

FORBES: Blackboard: Who Are The Buyers?

Apple said it is partnering with several major textbook companies -- including Pearson, McGraw-Hill and Houghton Mifflin Harcourt, who will make e-books for the store, according to Fortune.

CNN: Apple: School should center on the iPad