In BBC Inside Science, Adam Rutherford and guests illuminate the mysteries and challenge the controversies behind the science that's changing our world.
Tune in to BBC Radio 4 on Thursday 11 September at 16:30 to listen to this week's programme. More information and a link to listen again is available from the BBC's Inside Science pages.
On this week's programme:
Jack the Ripper 'identified': Some of us are morbidly fascinated by the legend of Jack the Ripper - not the world's first serial killer, but the one that coincided with the birth of mass media, and set the ghoulish tone for the 20th century's obsession with murderers.
This week a shawl acquired at an auction in 2007 is in the spotlight. Claimed to be found in 1888 at the murder scene of a woman asserted to be the fourth victim of the supposed Ripper, DNA evidence from the fabric is stated to imply one of the most plausible suspects - Aaron Kosminksi.
However, there are many problems with this 'identification' sequence, some historical, some legal, and some scientific. Adam Rutherford focuses on the science by speaking to Jari Louhelainen, a forensic geneticist at Liverpool John Moores University, who produced the forensic analysis.
Jon Wetton, another forensic geneticist at the University of Leicester, offers broader insight into how DNA can be used in detecting crime.