So, which wood board is the hardest? The answer is...drumroll please...the Brazilian Walnut, also known as Ipe! With a Janka rating of 3680, it is the hardest wood known to man. This dense and durable wood is highly resistant to decay and insects, making it a popular choice for outdoor applications such as decking and fencing.

- Teak: With a Janka rating of 1000-1155, teak is another dense and durable wood that is commonly used for outdoor furniture and decking.
- Ebony: Known for its striking black color and dense, heavy grain, ebony has a Janka rating of 3220, making it one of the hardest woods in the world.
- Mahogany: This beautiful and versatile wood has a Janka rating of 800-900, making it a popular choice for furniture and cabinetry.

In conclusion, the Brazilian Walnut, or Ipe, is the hardest wood board known to man. However, there are several other woods that are also quite hard and durable. When choosing a wood for your next project, be sure to consider the hardness and durability of the wood, as well as its appearance and other properties such as resistance to moisture and insects. With the right wood, you can create a beautiful and long-lasting piece that will stand the test of time.