Antonie van Leeuwenhoek

I have discovered that the teeth are not composed of bone, but of a very hard substance, which is full of small tubes.

I have seen that the hair is not hollow, but is composed of an infinite number of very small fibers.

I have observed that the smallest particles of matter are not all of the same size and shape.

I have discovered that the smallest living creatures are not all of the same kind, but are of many different species.

I have seen that the smallest living creatures are capable of eating and digesting food.

I have observed that the smallest living creatures are capable of excreting waste products.

I have discovered that the smallest living creatures are capable of breathing, like larger animals.

I have seen that the smallest living creatures are capable of swimming and flying.

I have observed that the smallest living creatures are capable of building nests and houses.

I have discovered that the smallest living creatures are capable of communicating with each other.

I have seen that the smallest living creatures are capable of forming colonies and societies.

I have observed that the smallest living creatures are capable of adapting to different environments.

I have discovered that the smallest living creatures are capable of evolving and changing over time.

I have seen that the smallest living creatures are capable of causing diseases in larger animals.

I have observed that the smallest living creatures are capable of curing diseases in larger animals.

I have discovered that the smallest living creatures are capable of producing useful substances for mankind.

I have seen that the smallest living creatures are capable of destroying harmful substances in the environment.

I have observed that the smallest living creatures are capable of transforming dead matter into living matter.

I have discovered that the smallest living creatures are capable of influencing the weather and climate.

I have seen that the smallest living creatures are capable of existing in extreme conditions, such as heat and cold.