Kat Arney's investigation of the pungent chemical in onions is enough to bring tears to your eyes

Epoxies – including hard-wearing resins and strong adhesives – can be found almost everywhere, from your household white goods to the Large Hadron Collider. And the aroma of these compounds cemented their place in Brian Clegg's childhood memories.

How one footballer's climate concerns led to the creation of a green chemistry company: Mike Freemantle discovers the story of Mathieu Flamini, GFBiochemicals and levulinic acid.

Florence Schechter discovers how a seemingly healthy grapefruit-based breakfast could disrupt your daily drugs

Kat Arney gets to the bottom of the story of phenolphthalein – a chemical with two very different uses. If you've measured pH in a classroom or had some trouble in the bathroom, you may have met this compound before.

A biologically active compound from the biblical balm of Gilead, said to 'heal the sin-sick soul'

Gege Li on the compound formerly known by the no-nonsense name 'very fast death factor'

Florence Schechter introduces an ancient, but effective, treatment for painful attacks of gout

What links blue jeans to ancient British warriors? Mike Freemantle discovers the blue dye with a colourful history

The latest in an alarming trend of novel psychoactive substances being mis-sold at festivals as traditional street drugs, putting users at risk