Artifacts, including ceramics, ground stone, and soil samples, as well as dental calculus, recovered from sites in the eastern North American central Plains were submitted to multiple laboratories for analysis of microbotanical remains. Direct accelerator mass spectrometer (AMS) dates of 361–197 cal BC provide evidence for the earliest use of maize (Zea mays ssp. mays) in this region. Squash (Cucurbita sp.), wild rice (cf. Zizania spp.), and palm (Arecaceae sp.) microremains were also found. This research adds to the growing evidence of the importance of microbotanical analysis in documenting plant use and in the identification of early maize. The combined data on early maize from the eastern Plains adds to our understanding of the timing and dispersal of this crop out of the American Southwest. Alternative explanations for the adoption and early use of maize by eastern central Plains communities include its value as a secondary resource, as an addition to an existing farming strategy, or as a component of Middle Woodland rituals.

Scholarship on political Islam suggests that support for early Islamist movements came from literate merchants, government officials, and professionals who lacked political representation. We test these claims with a unique tranche of microlevel data drawn from a Muslim Brotherhood petition campaign in interwar Egypt. Matching the occupations of over 2,500 Brotherhood supporters to contemporaneous census data, we show that Egyptians employed in commerce, public administration, and the professions were more likely to sign the movement's petitions. The movement's supporters were also overwhelmingly literate. Contrary to expectations, the early Brotherhood also attracted support from Egyptians employed in agriculture, albeit less than we would expect given the prevalence of agrarian workers in the population. A case study tracing Muslim Brotherhood branch formation and petition activism in a Nile Delta village illustrates how literate, socially mobile agrarian families were key to the propagation of the movement in rural areas.

Under what conditions did the first Islamist movements organize? Which social and institutional contexts facilitated such mobilization? A sizable literature points to social and demographic changes, Western encroachment into Muslim societies, and the availability of state and economic infrastructure. To test these hypotheses, we match a listing of Muslim Brotherhood branches founded in interwar Egypt with contemporaneous census data on over 4,000 subdistricts. A multilevel analysis shows that Muslim Brotherhood branches were more likely in subdistricts connected to the railway and where literacy was higher. Branches were less likely in districts with large European populations, and where state administration was more extensive. Qualitative evidence also points to the railway as key to the movement’s propagation. These findings challenge the orthodoxy that contact between Muslims and the West spurred the growth of organized political Islam, and instead highlight the critical role of economic and state infrastructure in patterning the early contexts of Islamist activism.

Diminishing availability and increasing costs of herbicides cause strawberry growers to seek both chemical and nonchemical alternatives, especially for within-row weed control soon after strawberries are transplanted. Several weed control treatments for strawberry establishment were examined during 2 yr in Minnesota. Treatments included: woolen landscaping fabric centered over the crop row; as above, but 2-ply fabric; spring canola incorporated into soil when 30 cm tall; as above, but canola killed with burndown herbicide and left as mulch; standard herbicide, DCPA; hand weeded; and no weed control. Areas between all strawberry rows were cultivated. Measurements included weed densities and weights, numbers of strawberry daughter plants, and fruit yield 1 yr after transplantation. The best alternative treatment was the 1-ply woolen fabric. It nearly eliminated weeds from rows, promoted daughter plant rooting, and allowed maximum fruit yields, equivalent to those of the DCPA and hand-weeded treatments. Canola mulch controlled weeds inconsistently and achieved only modest to low production of daughter plants and fruit. Weed control and fruit yield with incorporated canola were similar to the weedy check treatment.

The surface and bottom topography of the central Greenland ice sheet was determined from airborne ice-radar soundings over a 180 km by 180 km grid centered on the 1974 “Summit” site (lat. 72°18′N., long. 37°55′W.), using the Technical University of Denmark 60 MHz ice radar. Over 6100 km of high-quality radar data were obtained, covering over 99'% of the grid, along lines spaced 12.5 km apart in both north-south and east-west directions. Aircraft location was done with an inertial navigation system (INS) and a pressure altimeter, with control provided by periodically flying over a known point at the center of the grid. The ice radar was used to determine ice thickness; the surface topography was determined independently using height-above-terrain measurements from the aircraft’s radar altimeter. The calculated surface topography is accurate to about ±6 m, with this error arising mostly from radar-altimeter errors. The ice thickness and bottom topography are accurate to about ±50 m, with this error dominated by the horizontal navigation uncertainties due to INS drift; this error increases to about ±125 m in areas of rough bottom relief (about 12% of the grid).

The highest point on Greenland is at lat. 72°34′ N., long. 37°38′W., at an altitude of 3233 ± 6 m a.s.l. The ice surface at this point divides into three sectors, one facing north, one east-south-east, and one west-south-west, with each having a roughly uniform slope. The ice divide between the last two sectors is a well-defined ridge running almost due south. The ice is about 3025 m thick at the summit. Excluding the mountainous north-east corner of the grid, where the ice locally reaches a thickness of about 3470 m and the bed dips to about 370 m below sea-level, the maximum ice thickness, approximately 3375 m, occurs about 97 km south-south-west of the summit. The average bed altitude over the entire grid is 180 m and the average ice thickness is 2975 ± 235 m. The ice in most of the south-west quadrant of the grid is over 3200 m thick, and overlies a relatively smooth, flat basin with altitudes mostly below sea-level. There is no predominant direction to the basal topography over most of the grid; it appears to be undulating, rolling terrain with no obvious ridge/valley structure. The summit of the ice sheet is above the eastern end of a relatively large, smooth, flat plateau, about 10–15 km wide and extending about 50 km to the west. If the basal topography were the sole criterion, then a site somewhere on this plateau or in the south-west basin would be suitable for the drilling of a new deep ice core.

We present the first near millennium-length, annually resolved stable isotope record from bristlecone pines (Pinus longaeva, D.K Bailey). The carbon isotope ratios from the cellulose of seven trees from the White Mountains of California, corrected for anthropogenic changes in atmospheric chemistry, are used to reconstruct growing season (June through August) precipitation back to AD 1085. Extremely negative isotope results are strongly correlated with proposed severest El Niño events over the last 500 yr, and similar values in the first half of the millennium are used to reconstruct a further 13 strong El Niño events, concentrated in the 12th Century and the mid 13th and 14th Centuries. Ring-width chronologies from adjacent sites in the White Mountains demonstrate a high degree of decadal covariance with the δ13C series, although there are several periods of notable divergence.

In western Canada, more money is spent on wild oat herbicides than on anyother weed species, and wild oat resistance to herbicides is the mostwidespread resistance issue. A direct-seeded field experiment was conductedfrom 2010 to 2014 at eight Canadian sites to determine crop life cycle, cropspecies, crop seeding rate, crop usage, and herbicide rate combinationeffects on wild oat management and canola yield. Combining 2× seeding ratesof early-cut barley silage with 2× seeding rates of winter cereals andexcluding wild oat herbicides for 3 of 5 yr (2011 to 2013) often led tosimilar wild oat density, aboveground wild oat biomass, wild oat seeddensity in the soil, and canola yield as a repeated canola–wheat rotationunder a full wild oat herbicide rate regime. Wild oat was similarly wellmanaged after 3 yr of perennial alfalfa without wild oat herbicides.Forgoing wild oat herbicides in only 2 of 5 yr from exclusively summerannual crop rotations resulted in higher wild oat density, biomass, and seedbanks. Management systems that effectively combine diverse and optimalcultural practices against weeds, and limit herbicide use, reduce selectionpressure for weed resistance to herbicides and prolong the utility ofthreatened herbicide tools.

Perspectives from 22 countries on aspects of the legal environment for selection are presented in this article. Issues addressed include (a) whether there are racial/ethnic/religious subgroups viewed as “disadvantaged,” (b) whether research documents mean differences between groups on individual difference measures relevant to job performance, (c) whether there are laws prohibiting discrimination against specific groups, (d) the evidence required to make and refute a claim of discrimination, (e) the consequences of violation of the laws, (f) whether particular selection methods are limited or banned, (g) whether preferential treatment of members of disadvantaged groups is permitted, and (h) whether the practice of industrial and organizational psychology has been affected by the legal environment.

Reliability and degradation processes in broad-area InGaAs-AlGaAs strained quantum well (QW) lasers are under intensive investigation because these lasers are the key components for fiber lasers and amplifiers that have found both industrial and military applications in recent years. Unlike single-mode lasers that were developed for high reliability telecom applications, broad-area lasers were mainly targeted for applications that require less stringent reliability of the lasers until recently. Especially, the lack of field reliability data is a concern for satellite communication systems where high reliability is required of lasers for long-term duration. For our present study, we addressed this concern by performing long-term life-tests of broad-area InGaAs-AlGaAs strained QW lasers and also by studying mechanisms that are responsible for catastrophic degradation of the lasers.

(See the commentary by Van Schooneveld and Rupp, on pages1100–1102.)