This article concentrates on what historians have borrowed and adapted from neighbouring disciplines in the last few decades, rather than what they have lent (much more rarely). It discusses the ‘social turn’ of the 1960s, the movements for historical anthropology and ‘psychohistory (drawing on psychoanalysis) in the 1970s, the literary turn of the 1980s (ranging from the poetics of history to the analysis of ‘fiction in the archives’), the history of ‘social’ or ‘cultural’ memory, the rise of the history of gender, and the ‘cultural turn’ of the 1990s. In those forty years, historians were often in dialogue with social scientists and with other scholars in the humanities. In the 21st century, by contrast, there has been a rapprochement with experimental psychology and neuroscience (in the case of studies of memory and emotion) and with biology, culminating – so far – in a ‘bio-history’ concerned with the co-evolution of humans and animals. The famous opposition between ‘nature’ and ‘culture’ is melting away.

Yield losses due to weeds are a major threat to wheat production and economic well-being of farmers in the United States and Canada. The objective of this Weed Science Society of America (WSSA) Weed Loss Committee report is to provide estimates of wheat yield and economic losses due to weeds. Weed scientists provided both weedy (best management practices but no weed control practices) and weed-free (best management practices providing >90% weed control) average yield from replicated research trials in both winter and spring wheat from 2007 to 2017. Winter wheat yield loss estimates ranged from 2.9% to 34.4%, with a weighted average (by production) of 25.6% for the United States, 2.9% for Canada, and 23.4% combined. Based on these yield loss estimates and total production, the potential winter wheat loss due to weeds is 10.5, 0.09, and 10.5 billion kg with a potential loss in value of US$2.19, US$0.19, and US$2.19 billion for the United States, Canada, and combined, respectively. Spring wheat yield loss estimates ranged from 7.9% to 47.0%, with a weighted average (by production) of 33.2% for the United States, 8.0% for Canada, and 19.5% combined. Based on this yield loss estimate and total production, the potential spring wheat loss is 4.8, 1.6, and 6.6 billion kg with a potential loss in value of US$1.14, US$0.37, and US$1.39 billion for the United States, Canada, and combined, respectively. Yield loss in this analysis is greater than some previous estimates, likely indicating an increasing threat from weeds. Climate is affecting yield loss in winter wheat in the Pacific Northwest, with percent yield loss being highest in wheat-fallow systems that receive less than 30 cm of annual precipitation. Continued investment in weed science research for wheat is critical for continued yield protection.

Within the holdings of the Thomas Fisher Rare Book Library at the University of Toronto there is a curious, rarely examined handwritten book entitled Opera Evangelica, containing translations of several apocryphal works in English. It opens with a lengthy Preface that provides an antiquarian account of Christian apocrypha along with a justification for translating the texts. Unfortunately, the book's title page gives little indication of its authorship or date of composition, apart from an oblique reference to the translator as ‘I. B.’ But citations in the Preface to contemporary scholarship place the volume around the turn of the eighteenth century, predating the first published English-language compendium of Christian apocrypha in print by Jeremiah Jones (1726). A second copy of the book has been found in the Cambridge University Library, though its selection of texts and material form diverges from the Toronto volume in some notable respects. This article presents Opera Evangelica to a modern audience for the first time. It examines various aspects of the work: the material features and history of the two manuscripts; the editions of apocryphal texts that lie behind its translations; the views expressed on Christian apocrypha by its mysterious author; and its place within manuscript publication and English scholarship around the turn of the eighteenth century. Scholars of Christian apocrypha delight in finding ‘lost gospels’ but in Opera Evangelica we have something truly unique: a long-lost collection of Christian apocrypha.

The concentration of radiocarbon (14C) differs between ocean and atmosphere. Radiocarbon determinations from samples which obtained their 14C in the marine environment therefore need a marine-specific calibration curve and cannot be calibrated directly against the atmospheric-based IntCal20 curve. This paper presents Marine20, an update to the internationally agreed marine radiocarbon age calibration curve that provides a non-polar global-average marine record of radiocarbon from 0–55 cal kBP and serves as a baseline for regional oceanic variation. Marine20 is intended for calibration of marine radiocarbon samples from non-polar regions; it is not suitable for calibration in polar regions where variability in sea ice extent, ocean upwelling and air-sea gas exchange may have caused larger changes to concentrations of marine radiocarbon. The Marine20 curve is based upon 500 simulations with an ocean/atmosphere/biosphere box-model of the global carbon cycle that has been forced by posterior realizations of our Northern Hemispheric atmospheric IntCal20 14C curve and reconstructed changes in CO2 obtained from ice core data. These forcings enable us to incorporate carbon cycle dynamics and temporal changes in the atmospheric 14C level. The box-model simulations of the global-average marine radiocarbon reservoir age are similar to those of a more complex three-dimensional ocean general circulation model. However, simplicity and speed of the box model allow us to use a Monte Carlo approach to rigorously propagate the uncertainty in both the historic concentration of atmospheric 14C and other key parameters of the carbon cycle through to our final Marine20 calibration curve. This robust propagation of uncertainty is fundamental to providing reliable precision for the radiocarbon age calibration of marine based samples. We make a first step towards deconvolving the contributions of different processes to the total uncertainty; discuss the main differences of Marine20 from the previous age calibration curve Marine13; and identify the limitations of our approach together with key areas for further work. The updated values for ΔR, the regional marine radiocarbon reservoir age corrections required to calibrate against Marine20, can be found at the data base http://calib.org/marine/.