How does the concept of wave functions apply to large objects?

[Ty1erC]

Let me preface this by saying I am no physicist. This is a hobby of mine, and I'm trying to piece together knowledge as pick it up from different sources.

I understand the particle/wave duality of particles like electrons (at least I think so). I cannot grasp, however, the leap in thinking that associates ALL objects (like people) with wave functions. Can someone enlighten me on this?

 

[NobodySpecial]

Everything has a wavelength but the larger the object the smaller the wavelength so it's only noticeable for pretty small things - like electrons or photons.

There is a great series of books by the famous physicist George Gamov, the Mr Tompkins books, one of which describes what would happen if Planks constant (the number that sets the size of this effect) were larger. Elephants would just be a little but fussy around the edges but a mosquito would be spread of a cubic mile and impossible to swat. tigers running though a forest would be diffracted and come out at different angles.