Testing ruled out their first suspicion. But further tests pinpointed what they — and the boy — had been missing: iodine. A century ago, iodine deficiency affected kids across large swaths of ...

Iodine is an essential trace mineral. Animal-based foods like milk, fish, and eggs most famously make up iodine intake, though plant foods also contain iodine. Here’s everything you need to know about ...

How could such a tiny piece of matter have mattered so much? After all, as Mr. Tonelli suggests in the subtitle to his book, matter is a “magnificent illusion.” Mr. Tonelli bookends “Matter ...

Testing ruled out their first suspicion. But further tests pinpointed what they — and the boy — had been missing: iodine. A century ago, iodine deficiency affected kids across large swaths of ...