A Minoan Dagger from Gournia

Transpericardial phrenicotomy from a dagger wound.

Many examples of penetrating wounds of the heart and pericardium have been recorded (Barrett, 1950). The phrenic nerve has occasionally been divided in the neck as a result of knifing (Reichl, 1932) or of gun-shot wounds (Neuhofer, 1922), but the literature contains no reports of injuries to the phrenic nerve in the chest in which the patient has survived. The following case is therefore of int...

Minoan weights

Galileo's Dagger.

Galileo found that fine lines on a balance scale dazzled his eyes and were unreadable. So he used a grid of fine wires instead and ran his dagger across it, counting the number of auditory clicks. This is the first known experiment on sensory substitution.

Monads on Dagger Categories

The theory of monads on categories equipped with a dagger (a contravariant identity-on-objects involutive endofunctor) works best when all structure respects the dagger: the monad and adjunctions should preserve the dagger, and the monad and its algebras should satisfy the so-called Frobenius law. Then any monad resolves as an adjunction, with extremal solutions given by the categories of Kleis...

Cloak-and-dagger publishing.

71 SPECIALSECTION could escape from a lab and cause a human pandemic, or that revealing details about the research could inadvertently aid terrorists seeking a bioweapon. They asked the National Science Advisory Board for Biosecurity, set up after the 2001 anthrax attacks, to review the H5N1 studies. It initially recommended that the papers be published only if journal editors deleted key metho...