Estes, Wellman & Woolley (1989) have shown that children as young as 3 years of age can distinguish between mental entities such as an image or dream of an object and a real object. Nevertheless, children often show persistent fear of imaginary creatures, particularly monsters (Jersild, 1943). To find out what conception children have of such imaginary creatures, 4‐ and 6‐year‐olds were questioned about three types of item: real items (e.g. a cup), ordinary imagined items (e.g. an image of a cup) and supernatural imagined items (e.g. an image of a monster). In two experiments, both age groups sharply differentiated the real items from both types of imagined item. Despite this apparently firm grasp of the distinction between fantasy and reality, two further experiments showed that 4‐ and 6‐year‐olds are not always certain that a creature that they have imagined cannot become real. Having imagined a creature inside a box, they show apprehension or curiosity about what is inside the box, and often admit to wondering whether the creature is actually inside. The experiments suggest that children systematically distinguish fantasy from reality, but are tempted to believe in the existence of what they have merely imagined.

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The structure of the liquid-vacuum interface in room temperature ionic liquids (ILs) is investigated using angle-resolved X-ray photoelectron spectroscopy (ARXPS) and synchrotron X-ray photoelectron spectroscopy (SXPS). By varying the polar angle and comparing the results for the chosen ionic liquids, we identify the presence of a surface layer that is chemically different to the bulk. In particular, this layer: (i) is enriched by aliphatic carbon atoms from the saturated carbon chains of the anions and cations, and (ii) contains an unequal distribution of cations and anions in a direction normal to the surface. This unequal distribution creates a potential gradient which extends from the surface into the liquid. We show unequivocally that this layer is not due to the presence of impurities.

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Biochar application to agricultural land has been proposed as a means for improving phosphorus (P) availability in soil. The purpose of the current study was to understand how pyrolysis temperature affects P speciation in biochar and how this affects availability of P in the amended soil. Biochar was produced at different temperatures from digestate solids. The primary species of P in digestate solids were simple calcium phosphates. However, a high co-occurrence of magnesium (Mg) and P, indicated that struvite or other magnesium phosphates may also be important species. At low temperatures, pyrolysis had little effect on P speciation; however, as the temperature increased above 600 °C, the P gradually became more thermodynamically stable in species such as apatite. At very high temperatures above 1000 °C, there were indications of reduced forms of P. Biochar production decreased the immediate availability of P in comparison with the original digestate solids. However, for biochar produced at low temperatures, availability quickly increased to the same levels as in the digestate solids. For biochar produced at higher temperatures, availability remained depressed for much longer. The low availability of P in the biochar produced at high temperatures can probably be explained by the formation of less soluble P species in the biochar. In contrast, the transient decrease of availability of the P in the biochar produced at low temperatures can be explained by mechanisms, such as sorption on biochar, which gradually decreases because of oxidation of the biochar surfaces or changes in pH around the biochar particles.