Chemistry

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Interactive Features | More Science Whether gas, liquid or solid; radioactive or stable; reactive or inert; toxic or in your vitamin pill, the 118 building blocks each has its own chemically idiosyncratic characteristics--and certain commonalities.

The Elements Revealed: An Interactive Periodic Table: Scientific American

http://www.scientificamerican.com/article.cfm?id=chemistry-the-elements-revealed-interactive-periodic-table

JAMES WATT Y LA MAQUINA DE VAPOR

Pero quien inventó la máquina de vapor que realmente revolucionó al mundo, fue el mecánico escocés James Watt . http://www.tecnologias.us/JAMES%20WATT%20Y%20LA%20MAQUINA%20DE%20VAPOR.htm