How can you stop your pet rabbit or rodent going potty?
How can you mend a hole in the ozone layer?
How can you stop your trousers getting horribly muddy?
How can you re-invent the tandem?
How do you make a kimono?
How do you make a non-Newtonian, thixotropic, sometimes liquid, some times semi-solid substance.
How can you hang a picture with a fork?
How can you tell if a baby is dehydrated?
How many cans can be taken from this wall (of cans) before it tumbles?