Here's a terrifying fact: Your immune system is powerful enough to destroy you. Every day, it's scanning for threats, ready to unleash cellular warfare. The 2025 Nobel Prize in Medicine went to three scientists who discovered why it doesn't: regulatory T cells, the peacekeepers that prevent your immune system from attacking your own body. Their breakthrough launched cancer treatments and autoimmune therapies but took 30 years to win recognition.

This discovery shows us that sometimes the smallest things (microRNAs are tiny!) can have the biggest impact on how our bodies work.