Sentence:  In his first book since the 2008 essay collection "Natural Acts: A Sidelong View of Science and Nature", David Quammen looks at the natural world from yet another <WSD>angle</WSD>: the search for the next human pandemic, what epidemiologists call “the next big one.” 
Meaning of the word marked with <WSD> tags:  (viewpoint) A viewpoint; a way of looking at something.