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Moreover , those scholarly resources that are available on the web often portray religion as an item of deeply personal meaning that is somehow removed from history and culture , instead of taking seriously that those beliefs , practices , and institutions that we name as religion - - whatever else they may or may not be - - are items of observable human history and culture that can be studied . Research studies that correlated self-assessed cervical mucus with hormonal markers of fertility seem to indicate that on average there are 6 days of observable cervical mucus before the estimated day of ovulation . While the companion paper concentrates on identification and estimation , here we give a full characterization of the generalized dynamic factor model in terms of observable spectral density matrices , thus laying a firm basis for empirical implementation of the model . I am talking more of observable situational change ( e.g . The Relational Mind model is testable in many ways , with predictions of observable thalamic timing systems and specific timings for the turning on of appropriate working memories , differentially for peripheral , thalamic and cortical stimulation . However , research also shows that approximately 20-30 % of cycles will have less than 5 days of observable cervical mucus before the estimated day of ovulation .