There is, however, substantial variability in the strength of sibling relations within families, with some individuals receiving greater potential benefits from this tie than do their brothers and sisters. (academic.oup.com)
MRIs of eight living chimps reveal substantial variability in the shape and location of certain features on the brain surface. (sciencenews.org)
Additional escalation of the mining impact occurs as conventional oil mining is supplanted by tar sands development, with mining and land disturbance from the latter producing land use - related greenhouse gas emissions as much as 23 times greater than conventional oil production per unit area [152], but with substantial variability and uncertainty [152]--[153]. (journals.plos.org)