"We choose to examine a phenomenon which is impossible, absolutely impossible, 
to explain in any classical way, and which has in it the heart of quantum mechanics. 
In reality, it contains the only mystery."
The Feynman Lectures on Physics, Volume III, 1-1.

Particles (electrons or ions) which are emitted from a sharp tungsten tip (right)
may pass a thin wire either on the left or right hand side.
By applying a voltage to the wire the two beam parts overlap
and interfere (left). (JPG,15 k)

Interference pattern of 700 eV electrons with a positive voltage
applied to the wire in the biprism. Beginning with the shadow of the wire,
interference fringes become visible as the wire voltage is increased. (GIF,110 k)

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