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An atom is made up of electrons, protons and neutrons. Electrons have a negative charge (-1), protons have a postive charge (+1) and neutrons have a neutral charge.

Atoms must have a neut...

White blood cells in the body can attack pathogens, which are micro-organisms which cause disease. 

The white blood cells can ingest the pathogen, produc...

The words 'encantar' - to love, 'faltar' - to be lacking something, 'interesar' - to be interesting to, 'aburrir' - to bore, 'fascinar' - to be fascinating to, 'bastar' - to be sufficient to, 'molestar...

In English we add 'er' at the end of the word to form a comparative (i.e. pretty -> prettier, shallow -> shallower).

In Latin you add 'ior' at the end for the masculine and feminine...

Polymers are large molecules made from lots of repeating units called monomers.

Plastic bags, waterproof coatings on clothes and wound dressings can all be made from poly...