Propagation can be encumbered in an excitable cable in which intrinsic properties change abruptly. A sudden increase in diameter or a decrease in conductivity or excitability can lead to propagation block or delay in propagation with or without reflection. We study such transient phenomena from a geometric point of view. A simple two-cell caricature, with one cell enlarged to mimic diameter inc...

Armed conflicts are as old humanity itself. In past, regular armies were not established. The individuals, ordinarily the adults of hostile tribes, used to participate in armed conflicts. However, participation children was also common certain situations. Although would have been active participants, they engaged a strategic tool and proved be most vulnerable segment such situation. With passag...