Download e-book for iPad: A Short History of Nearly Everything by Bill Bryson

By Bill Bryson

ISBN-10: 0552997048

ISBN-13: 9780552997041

Invoice Bryson describes himself as a reluctant vacationer: yet even if he remains properly in his personal learn at domestic, he can't comprise his interest concerning the global round him. a quick heritage of approximately every little thing is his quest to determine every thing that has occurred from the massive Bang to the increase of civilization - how we obtained from there, being not anything in any respect, to right here, being us. invoice Bryson's problem is to take topics that in most cases bore the pants off such a lot folks, like geology, chemistry and particle physics, and spot if there isn't a way to render them understandable to those who have by no means proposal they can have an interest in technological know-how. It's no longer rather a lot approximately what we all know, as approximately how we all know what we all know. How will we understand what's within the centre of the Earth, or what a black gap is, or the place the continents have been six hundred million years in the past? How did an individual ever determine this stuff out? On his travels via time and area, he encounters a just right choice of astonishingly eccentric, aggressive, obsessive and silly scientists, just like the painfully shy Henry Cavendish who labored out many conundrums like how a lot the Earth weighed, yet by no means stricken to inform anyone approximately a lot of his findings. within the corporation of such impressive humans, invoice Bryson takes us with him at the final eye-opening trip, and divulges the realm in a manner such a lot people have by no means obvious it ahead of.

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2 Une surface Σ est traversée par une boucle (dont on n'a dessiné qu'un segment), au point P. La mesure de la surface est déterminée par le nombre de boucles qui la traversent. Une page de ce livre est traversée par environ 1070 boucles, c'està-dire un nombre à soixante-dix chiffres. La technologie actuelle n'est pas suffisante pour vérifier ces prédictions. Mais il est très important que la théorie fournisse des prédictions précises et, au moins en principe, vérifiables. Si elle ne le faisait pas, ce ne serait pas une théorie scientifique.

Nous avons l'habitude de penser que deux événements (l'arrivée de Christophe Colomb en Amérique et la mort de John Lennon par exemple) sont toujours ordonnés dans le temps, c'est-à-dire que l'un se produit avant et que l'autre se produit après. Nous avons l'habitude de penser que le temps est quelque chose d'universel, et que pour cette raison il y a un sens à se demander ce qui se passe en ce moment précis dans un autre endroit de l'Univers. Mais Einstein a compris que ce n'était pas le cas. La relativité du Temps L'illustration la plus frappante de la relativité du temps est appelée le paradoxe des jumeaux.

Imaginez un extraterrestre qui nous envoie un signal depuis Andromède. Nous recevons ce message aujourd'hui et nous y répondons immédiatement. Nous pouvons dire que le moment où l'extraterrestre a envoyé le signal se place avant aujourd'hui, et que le moment où il recevra la réponse viendra après aujourd'hui. Mais pendant les millions d'années qui s'écoulent entre l'envoi du signal par l'extraterrestre et sa réception de notre réponse, il n'existe pas de moment particulier sur Andromède qui corresponde à cet « aujourd'hui » sur la Terre.

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A Short History of Nearly Everything by Bill Bryson


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