Engineers think that an iceberg up to 11 kilometres long and 2 kilometres wide could be transported if the tug pulling it was as big as a supertanker.

If your hole ends up being a bit too big and the knots themselves don't hold the yarn in place, then tug on the yarn ends and stick some Popsicle sticks under the main knot to secure in place.

We're taking up this space tug which takes up cargo to the space station, and we're doing this to offset the operations costs.