To test preschoolers’ ability to flexibly switch between abstract rules differing in difficulty, nintythree 3-, 4-, and 5-year-olds were instructed to switch from an (easier) shape-sorting to a (harder) function-sorting rule, or vice versa. Children learned one rule, sorted four test sets, then learned the other rule, and sorted four more sets. In a control condition, seventy-two 3–5-year-old c...

T he world economy has experienced a bulk of positive and negative shocks in crude oil prices and exchange rates over the years, and that global inflation has undergone some changes. Such shocks have affected the macroeconomic variables in the countries of the world and have challenged the economies of these countries, and have led them to take different measures to protect themselves agai...

this study was conducted to define the prevalence and types of corneal astigmatism in relation with corneal optical power, axial length, sex and patient age. 641 cataract patients were included in a descriptive study. complete eye examinations were included in a descriptive study. complete eye examinations were performed. the data were analysed by standard procedures including analysis of varia...

in contemporary texts of islamic logic, the “subject-obversion” has been introduced as a rule on basis of which one can replace the subject term of a categorical proposition with its complement and change both quality and quantity of the proposition. thus from an a-proposition such as “all a is b”, one can infer “some not-a is not b”. well, let’s take that a is included by b but not vice versa,...

Identification of ambient-temperature ferromagnets is crucial for advancing established and emerging technologies including energy production, memory storage, spintronics. The authors outline the discovery basic properties compound Cr${}_{1+x}$Pt${}_{5\ensuremath{-}x}$P, first ternary material in Cr-Pt-P phase space. Sizable single crystals Cr${}_{1+x}$Pt${}_{5\ensuremath{-}x}$P are grown from ...