Sentence examples for existed about how from inspiring English sources
His voltaic pile, an early electric battery that produced a steady current, was developed in 1800 at a time when competing theories existed about how electricity was generated.
Even if they do make money, doubts may exist about how long that will last.
Yet, insufficient knowledge still exists about how conflicts between objectives appear and escalate during the reconstruction process.
As with most geologic processes that cannot be directly observed, a certain amount of uncertainty exists about how cumulates form.
Few concrete plans exist about how to rebuild north-eastern Japan after the tsunami and nuclear disaster in 2011.
Little evidence exists about how education influences the ways that registered nurses (RN) and registered practical nurses (RPN) negotiate their professional work relationships.
Undergraduate science, technology, engineering, and mathematics (STEM) students are often trained to use technical typesetting software in order to produce authentic mathematical prose, though little research exists about how this writing technology impacts students' thinking and computation process.
Marine protected areas (MPA) are rapidly being established to minimize the impact of anthropogenic disturbances, yet, while climate change is acknowledged as a growing threat, very limited research exists about how to directly incorporate climate-related disturbances into MPA design.
(It was also quite possibly the last opportunity to see several of the pieces, given the doubt that must exist about how long the company can continue without her).
There is considerable interest in harvesting perennial grasses planted in and around annual crops to serve as feedstocks for bioenergy and bioproducts, but little evidence exists about how configuration of perennials crops, and their management, influences their ability to provide ecosystem services.
