Geometría analítica del plano y del espacio

A wordless picture book in which a brown bear joins a polar bear in a tree surrounded by water, they find the treehouse there to be a good spot for reading books and, as the floodwaters recede, entertaining many other creatures.

Propongo en esta obra para debate, los curtidos con cereales de época antigua. Con ello pretendo abrir la puerta a un camino por andar en el que los cientificos e investigadores tengan en consideración la importancia de la piel en la supervivencia del hombre desde los tiempos más remotos. La investigación de campo, junto a las nuevas técnicas de análisis, aportarán datos esenciales en el establecimiento de los procesos de curtido. Con esta aportación deseo arrojar luz al conocimiento de la evolución de los curtidos que ha ido realizando el hombre a lo largo de su propia historia.

Children’s imaginations take flight as they learn how to make more than 60 sophisticated paper airplanes—from the Concorde and the arrowhead jet to a jumbo jet and an F-90 fighter—with this fun craft book. Each plane includes notes on the materials needed to bring it to life as well as information on the plane’s classification, whether fighter jet, glider, interceptor, or aerobatic jet. From planes that fly quickly for a short while to those that glide gently over long distances, this book provides a multitude of options for indoor and outdoor fun. Las imaginaciones de los niños...

Two-dimensional (2-D) shapes are all around you. There are regular and irregular 2-D shapes, which are both used in art including sculptures, mosaics, and paintings. One special pattern is a tessellation, which has shapes that fit together with no gaps in between. Many pieces of artwork and architecture use lines of symmetry-one side is exactly like the other. Another special pattern is a tangram, which is a puzzle in which there are different shapes that form a square.