Sentence:  In particular, we cannot choose the circumstances of our birth and our entire bodily condition. These "<WSD>facticities</WSD>" appear to us as having no foundation or justification. Why is one person born blind and another born with perfect vision? <WSD>Facticities</WSD> are thus contingent, they present themselves as simply "there." 
Meaning of the word marked with <WSD> tags:  In existentialism, the state of being in the world without any knowable reason for such existence, or of being in a particular state of affairs which one has no control over.