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Messenger RNA-based vaccines have been used successfully to kick start the antibody production needed to fight Covid-19. Now the technology has been successfully used to encourage the growth of new bones to heal severe fractures. The technique seems to work far better than the current alternatives says Maastricht University’s Elizabeth Rosado Balmayor.

Ivory smuggling continues to be a lucrative business for international criminal gangs, however, DNA techniques to trace where ivory seized by law enforcement authorities originates are now so accurate that individual animals can be pinpointed to within a few hundred miles. This says Samuel Wasser at the University of Washington, can be used as evidence against those ivory trafficking gangs.

And we look at development in attempts to detect and weigh neutrinos, elusive subatomic particles essential to our understanding of the makeup of the universe. Physicist Diana Parno from Carnegie Mellon University takes us through the latest findings.

Philologists have borrowed a statistical method from ecology to try and work out how much medieval romantic literature has been lost. The results seem to depend on which languages were involved, and like ecological systems, whether they were shared in isolated communities says Oxford University’s Katarzyna Kapitan

How good are you at finding your way from A to B? Humans throughout history have used all sorts of tools to get us to our destination – from a trusty map and compass to the instant directions on a smartphone sat nav. But CrowdScience listener Pam from Florida wants to know what happens when we leave the surface of the Earth – and try to navigate our way around space. Is there a North and South we can use to orientate ourselves? Which way is left if your nearest landmark is a million light-years away? And if you can’t tell which way is up, how do spacecraft know where they’re going? Presenter Anand Jagatia speaks to experts in an attempt to find his way through the tricky problem of intergalactic space navigation.

(Image: Knee X-ray, illustration. Credit: Science Photo Library via Getty Images)