A paper in the journal Science today reveals our clearest picture yet of how plants develop prickles. It also might shed light on precisely how they can be bred out of plants that we humans like cultivate.

And National Science Week is coming up, with RN exploring the night sky - and the issue of light pollutionGuest: Dr Jonathan Webb, ABC Science Editor

Brainteaser (answer in the audio):Rita goes on holiday for 10 days. She needs to take two pills every day: one from jar A and one from jar B - but all 20 pills look identical.On day 9, she accidentally spills two pills from jar A and muddles them with one from jar B.How can she still take the correct dose of each pill? For more of the latest science news, look for the science section on the ABC News website and sign up to a weekly email newsletter.