The Sphinx The Sphinx is 250 long and 60 ft high. Egyptologist's believed that the Sphinx was built in 2500 BC in the time of the pharaoh Chephren, but recent findings by John Anthony West suggest that there are water erosions unlike any other marks found on other Giza monuments. Unli...

Rank of a Matrix and Existence of a Unique Solution to an Equations System The rank of a matrix is the maximum number of linearly independent rows or columns in it. Alternatively, it is the order of the largest square sub-matrix possible with a non-zero determinant. If the matrix is of order m&ls...

Whether you know it or not, over the past 30 years fathers have been disappearing from American Families. Divorce has dramatically altered the roles of fathers for nearly half the children in our country. Parents today spend 40% less time with their children than parents of the previous generat...