Can grey ravens fly?: Beyond Frayling’s categories

Social cognition in ravens.

Complex social life has been proposed as one of the main driving forces for the evolution of higher cognitive abilities in humans and non-human animals. Until recently, this theory has been tested mainly on mammals/primates, whereas little attention has been paid to birds. Indeed, birds provide a challenge to the theory, on one hand because they show high flexibility in group formation and comp...

How High Can The U-CAS Fly?

The U-CAS is a spinning magnetized top that is levitated in a static magnetic field. The field is produced by a permanent magnet base, positioned below the hovering top. In this paper we derive upper and lower bounds for hm–the maximum hovering height of this top. We show that the bounds are of the form al0 where a is a dimensionless number ranging from about 1 to 12, depending on the constrain...

Shades of grey: radiopharmaceutical chemistry in the 1990s and beyond.

Science, like the universe itself, is ever expanding. The fields of biochemistry, physiology and pharmacology are rapidly growing, and radiopharmaceutical chemistry is no exception. In a recent Editorial Dr William C. Eckelman briefly reviewed the current status of radiopharmaceutical development (Eckelman, 1991). The ballots are out and returns are mixed. Radiopharmaceutical chemists have made...

The Mystery of the Ravens

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Beyond Pluralism: Foucault's Strategic Counter to Heterosexist Categories