self Maths Puzzle

Two Boys Cross a River
Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

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self Other Question

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?
Opaque Cube
You are making an opaque cube (ie you cannot see through its sides).

It can be any size that you want it to be.

Where do you place the cube so that you can see as many sides as possible?