Although there are dozens of different types of gems, among the best known and most important are diamond, ruby and sapphire, emerald and other gem forms of the mineral beryl, chrysoberyl, tanzanite, tsavorite, topaz and jade.
Safflower is unusual: if you add alkalis to the dye broth it is yellow; with acids it goes a beautiful crimson pink which is the colour of the original ‘red’ tape once tied around legal documents in England […].
I owe to my wife, Anna Christina (Kia) De Ozorio Nobre, not only a life full of love, but also the initial idea of dedicating more attention …
Historically, trigonometry has been applied in areas such as geodesy, surveying, celestial mechanics and navigation.
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