What are 5 interesting facts about kelp?

Could you possibly provide me with five intriguing tidbits regarding kelp? I'm genuinely fascinated by this marine plant and its many wonders. For instance, I've heard rumors about its remarkable growth rate, but I'm eager to learn more about its ecological significance, nutritional benefits, or any unique uses it might have in cuisine or medicine. Additionally, does kelp play a role in the global carbon cycle? I'm keen to understand how this versatile organism fits into the larger ecosystem and contributes to our understanding of marine biodiversity. Thank you in advance for sharing your knowledge!