The U.S. Department of Agriculture–Agricultural Research Service (USDA-ARS) has been a leader in weed science research covering topics ranging from the development and use of integrated weed management (IWM) tactics to basic mechanistic studies, including biotic resistance of desirable plant communities and herbicide resistance. ARS weed scientists have worked in agricultural and natural ecosystems, including agronomic and horticultural crops, pastures, forests, wild lands, aquatic habitats, wetlands, and riparian areas. Through strong partnerships with academia, state agencies, private industry, and numerous federal programs, ARS weed scientists have made contributions to discoveries in the newest fields of robotics and genetics, as well as the traditional and fundamental subjects of weed–crop competition and physiology and integration of weed control tactics and practices. Weed science at ARS is often overshadowed by other research topics; thus, few are aware of the long history of ARS weed science and its important contributions. This review is the result of a symposium held at the Weed Science Society of America’s 62nd Annual Meeting in 2022 that included 10 separate presentations in a virtual Weed Science Webinar Series. The overarching themes of management tactics (IWM, biological control, and automation), basic mechanisms (competition, invasive plant genetics, and herbicide resistance), and ecosystem impacts (invasive plant spread, climate change, conservation, and restoration) represent core ARS weed science research that is dynamic and efficacious and has been a significant component of the agency’s national and international efforts. This review highlights current studies and future directions that exemplify the science and collaborative relationships both within and outside ARS. Given the constraints of weeds and invasive plants on all aspects of food, feed, and fiber systems, there is an acknowledged need to face new challenges, including agriculture and natural resources sustainability, economic resilience and reliability, and societal health and well-being.

I shall venture to affirm, as a general proposition which admits of no exception, that the knowledge of this relation is not, in any instance, attained by reasonings a priori, but arises entirely from experience, when we find that any particular objects are constantly conjoined with each other.

Ted Honderich's ‘Causes and If p, even if x, still q’ contains many good points I shall not discuss. My discussion is restricted to some of the points Honderich makes about causal priority in the final two sections of his paper. He considers several proposals, new and old, for accounting for causal priority before he presents a tentativeproposal of his own. He thinks that some of these proposals, besides having difficulties peculiar to themselves, share the deficiency of lacking the proper character. When we look for the difference between causal circumstances and causes, on the one hand, and their effects, on the other, he says,

We are not pursuing any difference between these things. We arepursuing a difference of a certain character. What we are after has to do with what we say: that causes and causal circumstances make their effects happen, and not the other way on, and that causes and causal circumstances explain their effects, and not the other way on.

McTaggart's argument for the unreality of space, unlike his argument for the unreality of time, has nothing to do with token-reflexives. The argument for the unreality of time depends on the contention that there would be no time if there were no facts whose descriptions essentially contain temporally token-reflexive expressions such as ‘now’, ‘past’, ‘present’, and ‘future’. According to Michael Dummett, McTaggart was right not to make an analogous claim about space