ROCK EN POLONIA

En las palabras quirúrgicas que Cristóbal Pera tan magistralmente define, describe, analiza y valora, nos adentramos por un territorio nuevo, por una cálida geografía donde se enraíza todo conocimiento y todo saber. Por eso, la lectura de tan luminoso libro es una continua incitación al pensamiento-por algo brota del originario saber de las manos-, a la reflexión sobre la vida y la muerte, sobre el dolor y la felicidad, sobre la angustia y la esperanza. Emilio Lledó

Explains the basic science of flight, the problems of getting vehicles into the air, different types of engines, and aircraft design, and includes instructions for making aircraft models.

Describes tornadoes, how they form, and the tools scientists use to predict them--in both English and Spanish

There is a contest at a school to design a new playground. The students use blocks to build their models. As they build, they use three-dimensional shapes. Some students build a train out of blocks for the younger students to play on. Can you guess which three-dimensional shape they use for the train's wheels? Read to find out which design wins.