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We use the law of conservation of mechanical energy in order to study the motion of a double cone on a V track under different conditions (initial conditions and geometric configuration). We show that, depending on the geometric configurations, this problem exhibits three regimes of motion. At the most interesting one, the paradoxical regime, the double cone rolls to the upper section of the V track, even when we give it a small impulse in the opposite direction. In addition, we present the experimental system that we used to verify some of our theoretical results. [ABSTRACT FROM AUTHOR]

Cardiac myxomas are a rare but important cause of embolic events and cerebrovascular disease in children and adolescents. The authors report the case of a 12-year-old girl with sudden dizziness and right-sided paresthesia of the lips and fingers of the right hand. She was observed by a pediatric neurologist and brain magnetic resonance imaging suggested demyelinating lesions or vasculitis. Echocardiography showed a left atrial mass compatible with an atrial myxoma. The myxoma was surgically removed without complications. This case highlights the need for cardiac evaluation to rule out a cardiac tumor with embolic potential in the presence of any child with neurological manifestations of cerebrovascular disease with inconclusive brain imaging, even with no previous evidence of cardiac disease. Prompt clinical recognition and surgical removal are essential to prevent serious complications.

Anisakiasis is a human gastrointestinal parasitosis that results from accidental ingestion of infective larvae belonging to the Anisakidae family. Eleven codfish samples were analyzed and 64% did not conform to the present legislation, because they contained nematode larvae from the Anisakidae family and were therefore unfit for consumption.