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¿Son todas las hojas verdes? ¿Por qué?
El color verde del limbo de casi todas las hojas se debe a la presencia de clorofila, un pigmento que las plantas utilizan para fabricar los azúcares llamados hidratos de carbono a partir de agua y anhídrido carbónico. No todas las hojas son verdes; muchas contienen otros pigmentos que enmascaran el verde de la clorofila, […]
Before the encounter of two worlds
Little is known concerning the history of the Aztecs or Mexicas before their arrival to the Mexico valley during the XII and XIII centuries. Once they were established in this zone, they found many tribes, suffering numerous adversities, reason why they decided to refuge and settle themselves in the islets to the west of the […]
The power of ice
The cracks present in many rocks many times house small drops of water. When the temperature drops considerably, like in cold biomes, the drops freeze and manage to split up the rocks at their location. Why does this happen if rocks seem more resistant than water? Next, we will explain, with a simple experiment, the […]
