Contact

10 writers cannot keep 1,600 pages perfectly current on their own. If you find something wrong, telling us is genuinely useful.

The way to reach us is [email protected]. We read every message.

• Corrections — a wrong figure, a dead product, a claim we should not have made. Handled first.
• Suggestions — something we have not covered.
• Commercial and legal — licensing, reuse, press.

Every message is read. Not every message gets an answer — corrections do.

Where we are no use

We do not sell anything, so we have no part in your order. For a delivery, a refund or a return, that is Amazon. For a fault, a warranty claim or a manual, that is the manufacturer. We have no access to either and no way to look up an order.