A chemical found in products as diverse as fireworks and food packaging, perchlorate can interfere with thyroid function as well as foetal brain development.
What started as an anti-Catholic sectarian celebration is now a harmless festival to provide light and warmth on a winter's night.
Humans aren't alone in wanting to take revenge – some animals like to get their own back too.
Gunpowder, treason and plot: historical consultants to BBC drama explain their role on the show.
The deliberate spread of fear and violence goes back hundreds of years.
These days, we aren't often told when a terrorist plot is foiled, but Brits still set off fireworks to remember the one they do know about.
To achieve independence, history says you should play a long game.
Why did a hacktivist collective like Anonymous repurpose the image of Guy Fawkes for its ubiquitous masks? A scholar looks at how a 17th-century English villain became the face of resistance.