Original work, freely read, not freely taken.

What you are welcome to do

• Study freely: read, work through, and revise from any page, as much as you like, at no cost.
• Use it in your classroom: teachers may show these pages and simulations to their students and link to them in lessons and assignments.
• Link and share: share links to any page on this site freely, on social media, in class groups, or anywhere else.
• Quote briefly with credit: short quotations are fine if you credit TheLucidSTEM and link back to the page.

What is not allowed

• Copying or republishing: reproducing pages, text, simulations, or design on another website, app, or document without written permission.
• Passing it off: presenting any of this content as your own work, removing the TheLucidSTEM name, or removing copyright notices.
• Selling it: using any part of this site in a paid product or service without permission.
• Bulk scraping: automated downloading or mirroring of the site.

The interactive content and questions

The simulations are original code, and all practice questions on this site are original work written in the Cambridge examination style. They are not reproduced from past papers. They, like everything else here, are protected by copyright.

Permission and contact

If you would like to use this content beyond what is described above, for example in your own published materials, please ask first. Use the Suggestions button on the site to get in touch, and most reasonable educational requests will be granted gladly.

If you find this content reproduced elsewhere without permission, please let me know through the same button so it can be addressed.