The TVPK evaluation and recent conclusions from prominent early education researchers on the fleeting or uncertain effects of preschool on children's progress through later schooling send strong signals about how much we need to learn about how to do this productively. (educationnext.org)
PUZZLE PLANT After bursting on the scene in the 1960s, marijuana remains a substance with uncertain effects on mental health and medical conditions. (sciencenews.org)
The new legislation would reduce this requirement after 2021, with uncertain effects on the price of SRECs. (environmentalprogress.org)