Seeing double

Seeing double

From Unexpected Elements by BBC World Service

February 20, 2026 · 50 min

About this episode

The episode explores the complexities of identical twins in a murder trial, the potential for creating mirror life, and various scientific topics including crop loss and DNA evidence interpretation.

Identical twins on trial for murder in France have left forensic experts unable to answer the question of which one pulled the gun’s trigger. With both having the same DNA, it got the Unexpected Elements team thinking, when do identical twins cease to be identical? First, we look at how scientists have been confronting the possibility that they might soon be able to create an evil twin to life itself - mirror life. Also, we hear why the ‘Tatooine planets’ which orbit twin stars are so rare in our galaxy. We’re then joined by professor of developmental psychology Nancy Segal, who explains why prosecutors should be able to distinguish between the French twins on trial. Plus, we hear how African farmers are struggling with a lack of data on pre-harvest crop loss. And finally, why gorse flowers smell like pina coladas, and how the use of DNA evidence in court can still come down to interpretation. That’s all on this week’s Unexpected Elements. Presenter: Marnie Chesterton, with Kai Kupferschmidt and Michael Kaloki Producers: Ella Hubber, with Lucy Davies, Sophie Ormiston, Imy Harper and Tim Dodd

People in this episode

Host: Marnie Chesterton

Guest: Nancy Segal

Topics covered

  • identical twins
  • forensic science
  • DNA evidence
  • developmental psychology
  • crop loss
  • astronomy

Keywords

  • identical twins
  • murder trial
  • forensic experts
  • DNA
  • crop loss
  • Tatooine planets
  • developmental psychology
  • gorse flowers

Mentioned in this episode

Places: France, Tatooine

More episodes of Unexpected Elements

Explore listener stats, chart rankings, contacts and more on the Unexpected Elements podcast page.