Instead of the traditional "six degrees of separation" that researchers have historically observed between all people in the world (and Kevin Bacon), the number of degrees has been dropping since 2008 on the site, from 5.28 then to 4.74 now.
However, Christian Churches have historically observed other festivals which commemorate events in the life of Jesus or of significant individuals in the history of the Church.
While we can not exclude horizontal transmission from the first positive deer in each cohort, the timeframe for detection in the remaining deer (3 months) is less than half that which we have historically observed in deer inoculated orally with a brain homogenate from terminal CWD-infected deer [27], suggesting much earlier exposure to infectious prions.
The pattern of single-serotype predominance has been historically observed in the entire South Pacific region; 1 serotype circulates for 4 5 years before being displaced by another serotype, i.e., DENV-3 (1989–1996), DENV-2 (1996–2000), DENV-1 (2001–2009), and DENV-4 (2008–2009) (1 – 5 ).
When they occur within the Milky Way, supernovae have historically been observed by naked-eye observers as "new stars" where none seemingly existed before.
High arsenic (As) concentrations (up to 230 μg/L) have been historically observed (since 1999) in the upper Valtellina valley groundwater (UVV, central Italian Alps), and measured in samples collected during four campaigns of one full hydrological year (summer 2012 summer 2013).
Two main forms of clinical disease have been historically observed in endemic areas, at least until the advent of the first antibiotics, and the further blurring of the overall picture that occurred with the HIV pandemic.
The environmental movement, the report observed, "has historically been white middle and upper-class".
As such, bimodality has historically been sought in genetic research, yet few reproducible bimodal patterns have ever been observed in this field.
