Non-Newtonian Ball of Concrete

First off, I think that's a ball of cement not concrete, but I'm just saying that because of all the cool stuff I've learned about ceramics and composites in my material science learning.

I'd heard somewhere along the way that cement can - in the right mixtures and proportions - form a non-Newtonian fluid, but I've never played around enough to see what that mixture is.

By the way, in researching this post (seriously, I do research - it's how I learn stuff) I came across what looks to be a mildly scholarly (but still mostly understandable to me) chapter on non-Newtonian fluids  - what they are, how they work, application of them, examples - that I need to read through in more depth. Check it out yourself if you're so inclined.