Geógrafos, naturalistas e ingenieros en México, siglos XVIII al XX

Here is an intimate glimpse of the greatest scientist of our day, the brilliant physicist confined to a wheelchair whose "A Brief History of Time" has become the first worldwide scientific bestseller of the century. The story of Stephen Hawking's relentless quest for the secret of the origins of the universe will change forever the way you look at the stars . . . and your place among them.

Amb un criteri eminentment pràctic es permet dissenyar un sistema de qualitat per als laboratoris que ofereix un model de seguiment per a tots els processos que s'hi realitzen. Així, poden establir-se normes de qualitat internacional per obtenir uns resultats que s'atinguen als criteris de satisfacció del client i del professional, i que garantesquen la rendibilitat social i econòmica dels serveis que presten.

With a wealth of expertise and a keen sense of humor, this collection of essays delves into the chemistry behind Casanova's experiments with "Spanish Fly," the invention of gunpowder, the mysteries of baldness, and a multitude of other everyday phenomena and well-known stories. This one-of-a-kind guide is proof-positive that chemistry can be useful as well as enjoyable. Con una riqueza de pericia y un buen sentido de humor, esta colecci�n de ensayos explora la qu�mica tras los experimentos de Casanova con la cant�rida, la invenci�n de la p�lvora, los misterios tras la calvicie y una ...

Biographies and bibliographies of members are included in many of the volumes. Lists of members are usually given on covers of the numbers.