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"Debunking the social stigma around late risers, or what Einstein has to do with teens' risk for smoking. "Six hours' sleep for a man, seven for a woman, and eight for a fool," Napoleon famously prescribed. (He would have scoffed at Einstein, then, who was known to require ten hours of sleep for optimal performance.) This perceived superiority of those who can get by on less sleep isn't just something Napoleon shared with dictators like Hitler and Stalin, it's an enduring attitude woven into our social norms and expectations, from proverbs about early birds to the basic scheduling structure of education and the workplace. But in Internal Time: Chronotypes, Social Jet Lag, and Why You're So Tired, a fine addition to these 7 essential books on time, German chronobiologist Till Roenneberg demonstrates through a wealth of research that our sleep patterns have little to do with laziness and other such scorned character flaws, and everything to do with biology. In fact, each of us possesses a different chronotype - an internal timing type best defined by your midpoint of sleep, or midsleep, which you can calculate by dividing your average sleep duration by two and adding the resulting number to your average bedtime on free days, meaning days when your sleep and waking times are not dictated by the demands of your work or school schedule. For instance, if you go to bed at 11 P.M. and wake up at 7 A.M., add four hours to 11pm and you get 3 A.M. as your midsleep."

"The helpless, seemingly clueless infant staring up at you from his crib, limbs flailing, drool oozing, has a lot more going on inside his head than you ever imagined. A wealth of new research is leading pediatricians and child psychologists to rethink their long-held beliefs about the emotional and intellectual abilities of even very young babies. In 1890, psychologist William James famously described an infant's view of the world as "one great blooming, buzzing confusion." It was a notion that held for nearly a century: infants were simple-minded creatures who merely mimicked those around them and grasped only the most basic emotions-happy, sad, angry. Science is now giving us a much different picture of what goes on inside their hearts and heads. Long before they form their first words or attempt the feat of sitting up, they are already mastering complex emotions-jealousy, empathy, frustration-that were once thought to be learned much later in toddlerhood. They are also far more sophisticated intellectually than we once believed. Babies as young as 4 months have advanced powers of deduction and an ability to decipher intricate patterns. They have a strikingly nuanced visual palette, which enables them to notice small differences, especially in faces, that adults and older children lose the ability to see. Until a baby is 3 months old, he can recognize a scrambled photograph of his mother just as quickly as a photo in which everything is in the right place. And big brothers and sisters beware: your sib has a long memory-and she can hold a grudge."

"Upper-class people have more educational opportunities, greater financial security, and better job prospects than people from lower social classes, but that doesn't mean they're more skilled at everything. A new study published in Psychological Science, a journal of the Association for Psychological Science, finds surprisingly, that lower-class people are better at reading the emotions of others."