[161] The least time of vehicle travelling

[162] The distribution of the first digit in polynomials with positive integer coefficients

[163] On the Minimum Number of Convex Quadrilaterals in Point Sets of Given Numbers of Points

[164] From the Hinge Device to Curves of Linkages

[165] A Proof on the Non-differentiability of Weierstrass Function in An Uncountable Dense Set