Years ago, I developed the interactive maps showing little flying planes on FlightAware. I left to focus on improving a site I started 20 years ago, Ptable.com, now the world's most popular periodic table website and available in 50 languages.

Whether you're here to invest in the development of new features and visualizations for Ptable or just don't want ads to show up when you use it in your classroom, thank you for your support. I've been doing this for 25 years, and it's my promise to you that the site always stay independent and never show more than a single ad banner to non-patrons.

Help keep Ptable an anomaly. How often do you find a vestige of the old Internet, an independent site beholden to no investors, no educational conglomerate trying to suck you into some co-branded walled garden? Your donation is a message that says you value the existence of sites like Ptable and want them to stay independent.