One artifact from my childhood in the 1960’s that I still remember vividly is the series of plastic slidingblock puzzles manufactured by The Roalex Company of Forest Hills, NY (no relation to the maker of fine timepieces). These consisted of a high-quality plastic puzzle glued to a piece of cardboard containing information about the puzzle. Most of their sixty or so different designs were based...

We show that the mixing time for the fifteen puzzle in an n× n torus is on the order of n logn.

Recent studies have shown increased risk of musculoskeletal injury for athletes returning to play from concussion. It is possible that subtle deficits in neurocognition and neuromuscular control, such as inhibited concentration, balance, or prolonged reaction times could increase risk of subsequent injury. However, there is little understanding of the variables that may help characterize risk d...

background : biomarkers accepted for clinical use in breast cancer have low sensitivity and specificity. thus, there is a need for new markers to assist in the diagnosis, prognosis and follow-up of breast cancer patients. this study aims to investigate the diagnostic, prognostic and follow-up role of serum bcl-2, bax and p53 proteins in breast cancer patients in comparison with those of serum c...