9 years.</li>
          <li>Life on Earth will be impossible in ~1.1 billion years.</li>
          <li>Age of the Earth: ~4.543 billion years.</li>
          <li>Age of the Universe: ~13.799 billion years.</li>
        </ul>
        <h2>The Math Behind</h2>
        <ul>
          <li><a href="https://en.wikipedia.org/wiki/Birthday_problem">Birthday problem</a></li>
          <li><a href="https://en.wikipedia.org/wiki/Universally_unique_identifier#Collisions">Collisions</a></li>
        </ul>
      </div>
  