# Ancient Web: Kenneth Libbrecht Explained Why Snowflakes Branch Kenneth Libbrecht's Caltech-hosted SnowCrystals.com essay uses plain hypertext and small diagrams to explain ice dendrites, snowflake branching, and crystal growth. 2026-10-04 :: Switchboard Tech Services ![Ancient Web: Kenneth Libbrecht Explained Why Snowflakes Branch](https://switchboardtechservices.com/static/images/defaults/articles.webp) Part of the [Ancient Web Collection](https://switchboardtechservices.com/articles/ancient-web-collection/). The six-armed snowflake looks like somebody designed it with a drafting compass. It is actually the result of water molecules finding tiny advantages as ice grows. [Visit the Snowflake Branching page](https://www.its.caltech.edu/~atomic/snowcrystals/dendrites/dendrite.htm) This compact science lesson is part of **[SnowCrystals.com](http://SnowCrystals.com)**, a project by **Kenneth G. Libbrecht** at Caltech. The page footer contains an old visitor counter labeled as counting views since **February 1, 1999**, tying the collection's public-Web presentation to the late 1990s. The site has a decidedly early-Web layout: a long sidebar of small, descriptive links to natural snowflakes, laboratory-grown crystals, historic photographs, ice halos, snowflake physics, and activities for children. What survives is not merely a static photograph album but a set of independent explanations that can be followed in any order. ## A tiny bump turns into a branch The [branching article](https://www.its.caltech.edu/~atomic/snowcrystals/dendrites/dendrite.htm) explains the surprising physics in ordinary words. Water vapor has to diffuse through the air before freezing onto an ice crystal. A bump extending slightly beyond a flat ice surface can reach those molecules more easily. Because it grows faster, the bump gets still farther ahead, giving its next growth another advantage. Libbrecht calls this feedback a **branching instability**. Repetition creates smaller branches off larger branches, producing the tree-like forms called **dendrites**. The lesson describes how reduced air pressure means easier diffusion and fewer branches, while higher pressure can increase branching. There is a second force too: **faceting**, which favors simple, flat crystal faces. A snowflake's final shape depends on the balance between faceting and branching, changing with temperature and humidity. The site's navigation leads to [an introductory snowflake primer](https://www.its.caltech.edu/~atomic/snowcrystals/primer/primer.htm), [a guide to natural crystal types](https://www.its.caltech.edu/~atomic/snowcrystals/class/class.htm), and laboratory-grown 'designer' snowflakes. Those accompanying pages put the short branching essay inside a much larger public-science effort, even if not every image or legacy link is guaranteed to work in a modern browser. Its historical value is the form as much as the content: a scientist could put a genuinely useful lesson on a university-hosted page and connect it to dozens of examples without making visitors join a course. [Read the original snowflake branching explanation](https://www.its.caltech.edu/~atomic/snowcrystals/dendrites/dendrite.htm). Part of the [Ancient Web Collection](https://switchboardtechservices.com/articles/ancient-web-collection/). - Categories: [Ancient Web](https://switchboardtechservices.com/articles/categories/ancient-web/) - Tags: [#ancientweb](https://switchboardtechservices.com/articles/tags/ancientweb/), [#webhistory](https://switchboardtechservices.com/articles/tags/webhistory/), [#physics](https://switchboardtechservices.com/articles/tags/physics/), [#caltech](https://switchboardtechservices.com/articles/tags/caltech/), [#snowflakes](https://switchboardtechservices.com/articles/tags/snowflakes/) [Articles RSS](https://switchboardtechservices.com/feeds/articles.xml "Subscribe using an RSS reader") --- Canonical URL: https://switchboardtechservices.com/articles/ancient-web-kenneth-libbrecht-explained-why-snowflakes-branch/ Language: en-us Content type: article Author: Switchboard Tech Services Published: 2026-10-04T13:51:21+00:00 Modified: 2026-10-18T21:03:40.040135+00:00