I think... quantum mechanics

"I think
I can safely say that 
nobody 
understands 
quantum 
mechanics."

Richard Feynman,
The character of Physical Law (1965)

Spectrum Lab

   

As you can see from the three pictures above, when using the spectrometer towards the sunlight (1), ceiling light (2), and lamp light (3) they each have different emission spectra. 
Reema