Since I am doing testing this whole week, I did not learn anything from math. So, I found another story with holes. Lets see if you can figure it out.

A traveler on a deserted road came upon the body of a man lying by the roadside, dead. The dead man was wearing a knapsack. Though there are no marks on the body, or blood anywhere, the traveler could tell immediately the cause of death.

How was the traveler able to tell the cause of death immediately?

The answer is in the comments.