Amazon's 'frequently bought together' section pops up on any item, showing what other people have purchased alongside the item you're looking at.
Sometimes these suggestions are downright bizarre or inappropriate, but, it turns out, they can also be incredibly dangerous.
Chemicals with innocent, household uses are being coupled with ingredients that, when combined, can make a homemade explosive device.
While the items on their own are harmless, the fact that Amazon is suggesting them together is a big red flag.
Things like steel ball bearings — known to be used as makeshift shrapnel — connectors and push button switches are being shown as related items for certain chemical components.
These suggestions are not manual — they're automated via an algorithm which monitors what combination of items people regularly add to their basket.