"Fill in the numbers cleverly" at Taoii's Blog

There are eight circles, each connected by straight lines to adjacent circles, as shown in the figure on the left. Now, the numbers 1 through 8 must be placed into these circles. However, two consecutive numbers cannot be placed in circles that are directly connected by a line segment. For example, if the number 5 is placed in one of the top circles, then the numbers 4 and 6 cannot be placed in any of the three circles in the second row.

If we use logical reasoning, it is easy to find the solution to this problem.