"The idea that small causes may have large effects in general and in weather specifically was earlier recognized by French mathematician and engineer Henri Poincaré and American mathematician and philosopher Norbert Wiener. Edward Lorenz's work placed the concept of instability of the Earth's atmosphere onto a quantitative base and linked the concept of instability to the properties of large classes of dynamic systems which are undergoing nonlinear dynamics and deterministic chaos"
Or simply, "The Butterfly Effect"
A 2004 movie of the same name, gives a rather understandable look into universal mechanics.
Step on a butterfly while time traveling the Jurassic period, and you may be responsible for the procreation of said reptiles, into a skewed future.
Bronto ribs for dinner, yummy. Meet the Flintstones.... Yabba dabba doo.....
We all know how that turned out, eh?