"My interest in wildlife began early and I don't know how early because it's the only thing I've ever been interested in. I've always had a certain curiosity, a certain wonder about the natural world. I like to be outdoors."

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To find the length of an object, we have to perform certain physical operations. The concept of length is therefore fixed when the operations by which length is measured are fixed that is, the concept of length involves as much as and nothing more than the set of operations by which length is determined.

— Percy Williams Bridgman