Karl Bushby completes 28-year walk around the world, embraced by his mother

1. What happened

   According to a PBS headline, Karl Bushby has completed a 28-year walk around the world and was pictured embracing his mother. The headline is the only detail available to this explainer.

2. When it started

   The source does not give a date for the completion. The article's publication date is not known from the information provided.

3. How it spread

   The headline describes a walk lasting 28 years. The route, method of tracking and other details of the journey are not described in the available material.

4. Why it matters

   The available material does not say why the walk was undertaken. Further details would need to come from the full PBS report.