During my search for unusual surface features I took a look at the soil samples that were scooped up by Curiosity and I was quite amazed at what I found.
The image is a zoomed in view of the scoop contents from sol 074.
Take note of the lego-type shapes. What do you think they are?
Image number: 0074MR0518001000E
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"All truth passes through three stages. First, it is ridiculed; Second, it is violently opposed; Third, it is accepted as being self-evident."