So, when we got home, I put out the prickers, stickers and burrs that I had collected yesterday. I set them on white paper, with a couple of magnifying loupes, a microscope, a flashlight and a pair of socks. I invited the boys to examine.
They were amazed by what they saw. Ruben's first comment was, "Diego's socks are made out of strings!" But then, they noticed the hooks:
And the barbs:
And they got lost in this tiny world.
And then, there was the answer. Look at how they grab onto our socks!
(click on photos to view larger)