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Coming up, a trail of footprints captures a moment in the life of a family of ancient hominins.

Working on those footprints, putting my hands over them, it was really an exciting moment. And why scientists across the world have been working together to sequence the seahorse genome.

Seahorses are lovely. I think everybody loves seahorses.

Plus the spray-on chemical that could boost crop yield and resilience.

This is the Nature podcast for December 15th, 2016.

I'm Kerry Smith.

And I'm Adam Levy.

The sound was more like a squish than a thud as the tall Australopiths strode across the East African savannah.

A volcanic eruption had left a blanket of grey ash underfoot, while rainstorms that followed transformed the earth into wet cement.

Squish. Squish. Four small individuals, females and their young,

walk not far behind. Squish, squish, squish. Later, ash rained down from the sky again,

covering their tracks. And that was that, for 3.66 million years, until in the 1970s, the anthropologist Mary Leakey and her team found traces of the journey at a place called Leightoli in northern Tanzania.

They're the oldest known footprints of any ancient human relative, and they suggest that Australopiths walked on two legs pretty routinely.

Now, 40 years later, researchers found more footprints at the world-famous site.

Ewan Calloway spoke with paleontologist Marco Corrine of the University of Perugia in Italy.

Marco got a call from some colleagues in Tanzania when a building project unearthed the

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