Chemistry in its element

This week, we discuss team discuss the boundaries of the atom and breakdown the US's plan to eliminate synthetic food dyes with Jennifer Newton and Phillip Broadwith. The atomic radius of an atom is a concept we are taught from early in our chemistry careers, but for such an important value its definition remains ambiguous. Why is there no single answer to the size of an atom? And, US Health Secretary Robert F Kennedy Jr announced last year that the US will phase out all petroleum-based synthetic dyes in foods. But what are these chemicals, and what concerns exist around their consumption?

This week, we discuss reflections from this year's American Association for the Advancement of Science (AAAS) annual meeting and the latest advances in plasma chemistry with Rebecca Trager and Mason Wakley. The annual meeting of the AAAS kicked off in Phoenix, on the heels of the recent minibus spending package announcement, as well as the rescinding of the 2009 Greenhouse Gas Endangerment Finding. We'll fill you in on some of the conversations that took place that weekend. And, plasma is often described as the fourth state of matter, but what exactly is it made of? We'll explain it's make-up and dive into how chemists are learning to unlock its power.

Welcome to our latest podcast series, The chemical breakdown. Each week, we dive deeper into two stories we've covered here at Chemistry World, providing insight into the facts, why you should care, and what it means for the chemistry community. We also give you that week's headlines to keep you up to date with what's happening in the chemistry community. And finally, we'll end each episode with a brief section on what was happening this week in chemistry history. This week, we discuss the new deep learning model AlphaGenome and visit the very beginning of life on Earth with Mason Wakley and Neil Withers. Google DeepMind has released a new deep learning model that can predict the effect of small changes to DNA sequences up to one million base pairs in length. What does this new tech mean for our understanding of the human genome? And, how did life start on Earth, before the first cell came to be? We discuss the RNA world hypothesis and breakdown the chemistry it's built on. You can find more episodes of The chemical breakdown on the Chemistry world podcast feed. We would love to hear your feedback on this new podcast, so if you have any questions or comments please get in touch.

In this special podcast produced in partnership with Waters Corporation, find out how understanding the chemistry and materials that go into batteries marks the first step towards making them safer and increasing energy density, and unlocks new opportunities for reuse and recycling

How did a tree bark from Sri Lanka become one of the essential flavours of the festive season? We explore the history of cinnamon and the compound that gives it its distinctive taste and aroma

A compound so explosively unstable that nobody has been able to measure how sensitive it is without it, well, exploding.

How one of mankind's oldest pigments helped shepherds secure their sheep and inspired one of the most popular songs of the twentieth century

A sweet compound that provides ample energy for extreme endurance events – find out how maltodextrin helped Anna Ploszajski swim the English channel

Liquid salts, ionic melts, fused salts, or ionic glasses – call them what you like, these much-hyped solvents show great promise. Katrina Krämer speaks to chemical engineer Jason Bara about ionic liquids.

An antimicrobial compound that kills bacteria and viruses quickly – found in some of the most colourful antiseptic solutions

Does asparagus give you foul-smelling urine? Helen Arney investigates asparagusic acid, and the lavatorial genetic lottery that controls whether or not you can smell its distinctive aroma

A sweet treat with a deadly trick for Halloween – glycyrrhizic acid, or glycyrrhizin, is found in black liquorice and sweeter than sucrose, but can cause heart problems and even prove fatal if consumed in excess

Also known as 'milk of amnesia', propofol helps to prevent perception of pain in surgery – just don't forget its dangerous side

Hepatitis C drug sofosbuvir made waves when first launched – quicker to work and with fewer side effects than existing drugs, but it came with a hefty price tag

Meera Senthilingam makes a welcome return to the podcast with a drug that gives hope to the many sufferers of drug-resistant TB – still one of the world's biggest killers