You can thank physics for this one. If your shoelaces keep coming undone, never fear. Ian's secure shoelace knot, also known as a double slit knot, is here to the rescue. Here's how it works:
1. Tie a normal starting knot, then make both ends into loops.
2. Cross one loop in front of the other.
3. Wrap the first loop around the second and thread it through the hole.
4. At the same time, thread the second loop through the hole in the opposite direction.
5. Pull both loops through the hole.
6. Tighten!
Watch a YouTube video of how to tie the knot here.