Footprints of the past

Unravelling the 6-million-year-long story of where we came from is
a tricky business because palaeontologists have to rely on scarce,
precious fossil remains that are hard to access and even harder to
find in the first place. And there's a limit to what pieces of bone
and teeth can reveal about our ancestors. But, occasionally,
serendipity affords us a special glimpse into our past like it did
in Laetoli, Tanzania, where a nearby erupting volcano captured the
footsteps millions of years ago of a group of Australopithecines.
In episode 34 of the eLife Podcast we heard from University of
Perugia... Get the references and the transcripts for this
programme from the Naked Scientists website