For me it is the fact that our blood contains iron. I earlier used to believe the word stood for some 'organic element' since I couldn't accept we had metal flowing through our supposed carbon-based bodies, till I realized that is where the taste and smell of blood comes from.

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[โ€“] 26 points 3 years ago* (last edited 3 years ago) (2 children)

Also the idea that light is both a particle and a wave always messed with my head because I wanted to know why does it decide to change and when? And the answer is that light is always a particle and always a wave at the exact same time.

It is a wave particle.

And it is possible from light alone to build both an electron and a positron as demonstrated in a 1999 laser science experiment in New York.

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  • [โ€“] 23 points 3 years ago

    I usually interpret this as behaviour: photons are not "particles" or "waves", photons are photons. They just behave as waves and as particles, depending on how you're looking at them.

    Note that even things with a resting mass (like you or me) are like this, too. It's just that, as the mass increases, the wave behaviour becomes negligible.

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