For example, the reef knot is the strongest knot in existence ... the researchers suggest that objects that aren't rigid - such as rope or string - may be harder for people to reason about.

strong enough to hold the forces generated by a fall, and is relatively easy to untie after it has been loaded by a fall. To tie into a harness with a Figure 8 Follow-through, tie a Figure 8 knot in ...

The Mule Knot (a.k.a releasable knot) is ideal to lock off the rope on the belay plate. There are many occasions in climbing when, belaying from the harness using a device which does not self-arrest ...