You are about to make an important decision this afternoon? Back to the future! Or the next week. In the brilliant book "The right time, the science of perfect timing," - published by editions Flammarion - two sociologists from Cornell university have sifted through no less than 500 million tweets written by more than 2 billion human beings through a computer program text in order to evaluate their emotional content. The result is as fun as it is informative: the messages posted in the morning are decidedly optimistic. And more the day passes, the more the messages become defeatist... until the end of the day, where the tone becomes again positive.

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As to the portion of the population which is concerned by this trend, no complications to note: this result is valid everywhere in the world. No matter the age, color of skin, or the strat social individuals concerned! All the world is housed in the same boat. Positive mood increases the morning, declines after the lunch hour, and increases again at the end of the day. In truth, it's all a matter of timing: this book is an ode to the question "when?". It is a synthesis of the latest research in psychology, biology and neuroscience.

At 9 o'clock in the morning, the probability of encountering a problem is 1%. This probability rises to 4% at 16 hours.

In the same book, we can read other findings scientists - more than 700 in total - all amazing. Thus, through a method similar to that used for the tweets, one can get the flavor of the conversations that were issued in 2100 american companies listed in the stock Exchange! The telephone calls vary in a similar way: optimistic and supportive in the morning, to be more negative in the afternoon, and positive again in the evening... when the markets have closed! Proof, once again, that all human beings are affected by this logic. "Even the most for economic agents operating in a context that is highly incentive are influenced by diurnal rhythms, in the exercise of their responsibilities," writes Daniel Pink to diagnose the research.

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"through a chronological" does not, moreover, that the business: the research has also established that the jurors of a trial, condemned more heavily in the afternoon! Individuals judged in the morning so have more chance of getting a penalty more lenient. And this is not all: the guinea pigs to memorize better wake up in a sequence of syllables that after their lunch. In medicine, researchers from Duke university have proven that "adverse events" in the operating room are "more numerous between 15 and 16 hours." At nine o'clock in the morning, the probability of encountering a problem is 1 %, then to 16 hours, it climbs to 4%! Last anecdote, about the benefits of "breaks well under control": a "recreation" at the right time produces the equivalent of three weeks of extra lessons on students ' results, while a time to chat with a friend recharchera better for your batteries than a snack!

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