Caltech physicist Kenneth Libbrecht creates nearly identical "designer snowflakes" by precisely controlling growth conditions such as temperature, humidity, positioning, and air flow. Here's a 60 second explanation on YouTube.
Here are few articles by Libbrecht:
[More after the break.]
Morphogenesis on Ice: The Physics of Snow Crystals
Explaining the Formation of Thin Ice-Crystal Plates with Structure-Dependent Attachment Kinetics
An Investigation of Laboratory-grown Ice Spikes (DOI: 10.3189/172756504781830015)
The Physics of Snow Crystals
The Formation of Snow Crystals
A Convection Chamber for Measuring Ice Crystal Growth Dynamics
Crystal Growth in the Presence of Surface Melting and Impurities: An Explanation of Snow Crystal Growth Morphologies
(Score: 0) by Anonymous Coward on Saturday December 26 2015, @03:15PM
I create nearly identical turds every morning.