This piece stands out because it takes something we've all seen — snowflakes — and reveals the decades of physics behind why they look the way they do. Derek Muller frames his interview with Ken Liebrecht not as a simple nature lesson, but as a scientific investigation into one of nature's most elegant mysteries: why ice crystals grow in such varied forms.
"No two snowflakes are alike."
This is Wilson Bentley's famous claim — the meteorologist who first captured a close-up photograph in 1885 and spent his life documenting over 5000 snowflakes. But Muller notes Bentley selected only those in "pristine condition with uncommon beauty and symmetry." The images we know aren't representative of most snowflakes at all.
The piece makes a compelling argument: snowflake diversity isn't random chaos, but follows predictable patterns. As Muller puts it, "to some degree you can definitely look at a snowflake and say yeah i know what conditions that crystal grew under more or less." A snowflake's shape reveals its history — the temperature and humidity at each moment of growth.
The Nakaya diagram, developed in the 1930s at the University of Hokkaido in Japan, shows exactly which forms emerge at which temperatures. Around minus 2 Celsius you get plates; at minus 5, columns and needles; around minus 15, plates again. The pattern repeats — plates then columns then plates.
What makes this piece work is Muller's accessible explanation of complex physics. He describes how water molecules form a hexagonal crystal structure because "oxygen atoms attract electrons more than hydrogen and since the molecule has a bent shape it's polar with oxygen being slightly negative and the hydrogens slightly positive." The hydrogen bonds between molecules create that distinctive six-sided prism.
The piece's strongest contribution is Ken Liebrecht's hypothesis about nucleation barriers. These barriers determine whether basal facets or prism facets grow faster — and thus whether a snowflake becomes columnar or plate-like. Muller describes this as "consistent with all the different forms of snowflakes that grow at different temperatures."
Critics might note that while the molecular explanation is compelling, it remains a hypothesis under active investigation. The piece acknowledges Ken's experiments produced results that "agree nicely" but are still being tested.
Bottom Line
The core argument here — that snowflake diversity follows discoverable patterns through temperature and supersaturation — is solid science presented accessibly. The vulnerability is that this remains incomplete: the nucleation barrier hypothesis explains plates and columns at specific temperatures, but doesn't fully explain why we get "columns at around -5 celsius and then plates again at minus 15." That gap in understanding is precisely what makes the story interesting.