Privacy

Last updated October 2026

The tools on this site run in your browser. The numbers you type into a calculator are not sent to us or stored.

What we collect

• When you send a problem or sign up for lab notes, we receive what you enter in the form, such as your message, first name, and email address.
• Our host keeps standard server logs, like IP addresses and pages requested, for security.

How it's used

We use your message to decide what to investigate and to reply to you. We only show a message in a video if you checked the box saying we can, and your name stays hidden. We never sell your information.

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Your choices

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