Policies & support

Read the policies

Privacy Policy

What we collect, why we use it, and the choices you have.

Terms of Use

The conditions for using this free educational service.

Medical & AI notice

Use this bank for learning, with its limits in view.

Sources & copyright

How we describe material and receive content concerns.

Cookies & browser storage

The small pieces of information used to keep the study tools working.

Accessibility

A practical way to report barriers while the site is being improved.

Contact & requests

One contact point for the project, without a misleading support form.

Cloud service and records

This cloud edition provides question practice, reviewed essential figures, explanations, temporary guest visits and optional saved accounts. Full source PDF downloads and original page scans are not hosted in this edition. Supabase provides authentication; Cloudflare per-account private storage holds saved study records and shared D1 storage holds educational content.

Signed-in users can export study records from Account settings. Account deletion is handled through a verified email request, not an automatic deletion control. Encrypted guest state is kept in tab session storage rather than a persistent personal database, with four-hour idle expiry. Separate tabs can fork histories; ending a visit does not guarantee revocation of older copied tokens before their expiry.

The terms use Pennsylvania and applicable United States law, subject to mandatory protections. These pages do not certify legal clearance or permission to republish third-party material. For support, privacy or source-permission questions, use the project contact page.