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More people in the US are getting bird flu. Though numbers are small – just five new cases, all mild – every new case is a reason for concern. How and why is it being transmitted – and how is it being monitored?

What if you could make a sailboat that’s pushed not by wind, but lasers? Breakthrough Starshot is a mission attempting to send a spacecraft to our nearest star system, Alpha Centauri, using such a lightsail. While lightsail designs have been too expensive and unworkable so far, a new prototype is looking promising.

Climate change is threatening a key part of the global climate system. The Atlantic Meridional Ocean Circulation (AMOC) system transports heat and salinity between the tropics and the poles. Scientists have ongoing concerns about its stability, but it’s now showing signs of potential collapse much sooner than expected. And if it does shut down, the knock-on effects would be drastic.

What makes a planet a planet? Defining this is what knocked Pluto off planetary status, but now one researcher has proposed a new set of criteria. Is the new method useful – and does it change which objects are considered planets?

Believe it or not – sea slugs hunt in packs. A species of sea slug has been seen ganging up on brown sea anemones to avoid its poisonous tentacles. How are they capable of teaming up like this?

Hosts Rowan Hooper and Christie Taylor discuss with guests Grace Wade, Alex Wilkins, Madeleine Cuff and Sophie Bushwick.

To read more about these stories, visit newscientist.com.

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Weekly: New human cases of bird flu; Sail away to Alpha Centauri; Sea slugs hunt in packs

The World, the Universe and Us