Here's why:

* Boiling Point Elevation: The only way to increase the boiling point of water is by adding a solute that dissolves in it. This is called boiling point elevation and is a colligative property, meaning it depends on the number of solute particles present, not their specific identity.

* Pepper's Nature: Pepper is mostly insoluble in water. It doesn't dissolve and form individual particles that would increase the concentration of the solution.

* What Happens Instead: When you add pepper to water, it will mostly just sink to the bottom. It might slightly reduce the heat transfer efficiency to the water, making it *appear* to take slightly longer to boil, but it's not actually changing the boiling point.

In short, pepper does not raise the boiling point of water because it does not dissolve in water and therefore does not contribute to the concentration of the solution.