La historia de las innovaciones victorianas: Fracciones equivalentes (The History of Victorian Innovations: Equivalent Fractions)

La cultura medieval islámica ha dado figuras espléndidas. Omar Jayyam, poeta y filósofo, algebrista y astrónomo, es sin duda la más fascinante de todas. Su pensamiento fue heterodoxo, su saber inmenso, su obra variadísima. De lo que nos ha llegado de su poesía no siempre es fácil distinguir lo auténtico de lo apócrifo, y de lo que sabemos de su vida, la historia de la leyenda. Su más importante aportación algebraica, la resolución sistemática de las ecuaciones cúbicas cortando cónicas, se procurará poner al alcance de un lector moderno sin alterar las ideas de fondo.

Follows the life and career of the French scientist who proved the existence of germs and their connection with diseases.

'No Means No!' is a children's picture book about an empowered little girl who has a very strong and clear voice in all issues, especially those relating to her body and personal boundaries. This book can be read to children from 3 to 9 years. It is a springboard for discussions regarding children's choices and their rights. The 'Note to the Reader' at the beginning of the book and the 'Discussion Questions' on the final pages, guide and enhance this essential discussion. It is crucial that our children, from a very young age, are taught to have a clear, strong voice in regards to their...

Two books in one, this oversized volume shows readers the plants, root systems, insects, fossils, animals, mines, gems, minerals, and man-made wonders such as tunnels, subways, submarines, pipes, cables, and power lines that can be found underground or underwater in an unforgettable visual way. Each page takes you deeper and deeper under the waves or through layers of earth.