How the ass of a horse has determined the design of a space shuttle??

How the ass of a horse has determined the design of a space shuttle? And, that over 2000 years ago. Is that possible? 

Read the below post.

https://9gag.com/gag/an5bNVB

Can we use the same analogy to develop something similar? If so, what??

It made me think of few things. 

Firstly, butterfly effect.

"In chaos theory, the butterfly effect is the sensitive dependence on initial conditions in which a small change in one state of a deterministic nonlinear system can result in large differences in a later state."

Telugu speaking people are more familiar with this effect after watching the movie Nannaku Prematho by Sukumar. In simple words, a small change can cause an unimaginable effect in the future. But, what kind of implications does it have??

Secondly, time travel.

One of the interesting discussions which I love is time travel. I have less idea, but I'm curious, especially the theory behind it. Let's forget if it's practical or if it's feasible, but something which mostly everyone agrees in time travel is about a small change in the past can drastically affect the future, which might even create another reality (something which my brother-in-law and I discussed after watching the recent Avengers movie).

Recently, I saw a post in Reddit which said 

"when people talk about traveling to the past, they worry about radically changing the present by doing something small, but barely anyone in the present really thinks that they can radically change the future by doing something small."

So, what does this imply? Theoretically, if we change a small thing right now, it should have a significant impact in the future. But, does it really happen?? We often think that a small change isn't really impacting our lives and go back to previous habits.

How can we know if a small change has actually impacted a particular outcome? (from my current course on Monitoring, Evaluation & Learning (MEL), I understand that it's not an easy job and even MEL wouldn't give you 100% accuracy).

Let's evaluate backwards to find if a certain change has affected the outcome. A simple example is taking paracetamol reduces fever. What if we assume the same about our habits? Like changing something small in our lives can actually make a difference?? 

I'm not sure which habits or change I'm actually referring over here, but it's pretty interesting to see a small change actually has the impact for a larger unimaginable effect in the future.

And, if something like a horse's ass can determine the design of a space shuttle, I guess such a change can make dramatic impact if done in the right way.