Contact
The address for everything is [email protected]. It reaches the person who writes the entries, not a ticket queue, so a reply usually takes two or three working days.
What gets a fast reply
Corrections with a citation come first. Include the entry name (for example, spec / spect), the line you think is wrong, and the reference you are working from. If you have found a broken link or a diagram that does not match its table, that is worth a one-line email too.
What we cannot do
We do not write homework answers, translate documents, or give legal, medical or financial advice. Requests to place paid links, guest posts or advertorials are declined: the site carries advertising only through its ad network, and nothing on the page is sold as editorial space.
Reprinting
Short quotations with a link back are fine and need no permission. Republishing a full entry, or using the diagrams in teaching material that is sold, needs a written yes first. Ask at the same address and say what the use is.