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Brahmagupta used "debt" and "fortune" to describe negative and positive numbers.
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Hippocrates was known as the father of medicine and looked to identify helpful and hurtful characters of plants.
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Aristotle was known as the father of zoology, and arranged animals based on habitat.
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Theophrastus was known as the father of botany, and he separated plants by four groups (tree, shrubs...)
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Pliny the Elder was the first to introduce the first system of artificial organization and classification. "Historia Naturalis" was a book written by him and had information on over a thousand plants.
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Franciscan friar Luca Pacioli was the first to do double entry book keeping.
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Gerolamo Cardano first came across negatives in an equation when he had to sole sqrt(-15) in his "Ars Magna".
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Rafael Bombelli helped to contribute the correct rules for 'imaginary' numbers.
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John Wallis created the number line and it gave meaning to negative numbers.
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John Ray was the first to introduce the word "species" and described over 18,600 plants in his "Historia Generalis Plantanum".
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Carolus Linnaeus developed scientific system of naming species.
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Casper Wessel and Jean Argand created different representations of 'imaginary' numbers.
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George Peacock helped to work on logic and algebra to define negative numbers and math related to them.
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Sir Julian Huxley is now known as the father of new systematics - which is a combination of genetics, taxonomy, and other biological methods for classification.
