Author: BBC World Service

As Netflix cracks down on password sharing around the world - something it once encouraged - we wondered why people like to share passwords to other things, such as phones, email accounts and logins.

Passwords and encryption exist as ways of protecting us from hostile agents in most aspects of life. But timing is everything. Nature has been doing it for years of course. But climate change is upsetting some of the ecological match-ups of locks and keys, migration and feeding that have evolved over the millennia. We hear how the shifting patterns of weather and food availability is affecting cuckoos in Europe and India.

Another aspect of natural subterfuge is camouflage. Whilst physicists have been trying to make optical invisibility cloaks from ingenious new "metamaterials", Marc Holderied and team have been looking at how certain moths have used metamaterial properties in the structure of their wings to effectively hide from bats. They are acoustically invisible. Could similar materials be manufactured to make, for example, sound-proof wallpaper?

Also, we hear how India's Chandrayaan-3 moon mission - due to land on 23 August this year - is exciting millions of people.

Presenter: Marnie Chesterton Producer: Alex Mansfield, with Margaret Sessa-Hawkins, Ben Motley and Sophie Ormiston

“I’m bored!” We can all relate to the uncomfortable - and at times unbearable - feeling of boredom. But what is it? Why does it happen? And could this frustrating, thumb-twiddling experience actually serve some evolutionary purpose?

CrowdScience listener Brian started wondering this over a particularly uninspiring bowl of washing up and it’s ended with presenter Marnie Chesterton going on a blessedly un-boring tour through the science and psychology of tedium.

She finds out why some people are more affected than others, why boredom is the key to discovery and innovation and how we can all start improving our lives by embracing those mind-numbing moments.

(Photo: Bored kids on a park bench. Credit: Getty Images)

Presenter: Marnie Chesterton Producer: Samara Linton Production co-ordinator: Jonathan Harris Editor: Richard Collings

Contributors: Professor James Danckert, University of Waterloo, Canada Dr Elizabeth Weybright, Washington State University Dr Christian Chan, Hong Kong University Annie Runkel, University of Dundee

For the third year running, Iceland’s Reykjanes peninsula is experiencing another spectacular volcanic eruption. Volcanologist Evgenia Ilyinskaya has been out in Iceland witnessing the sight and getting samples of the noxious fumes.

Across the rest of the Northern Hemisphere heat domes persist, bringing extreme weather ranging from wildfires to tornadoes. We keep on seeing that this year “is the warmest in 120,000 years”. But what does that mean? Two paleoclimatologists, Bette Otto-Bliesner and Jessica Tierney tell us more.

And we’re going deep. Deep into the brain that is, with a newly-developed probe which is finer than a baby’s hair. Dr Anqi Zhang of Stanford University explains her delicate technology.

Finally, new research suggests that SARS-CoV-2 could have arisen in the wild no more than four years ago, a mishmash of other viral genomes. Bioinformatician Jonathan Pekar discusses his new paper.

Presenter: Roland Pease Producer: Ella Hubber Editor: Richard Collings

(Photo: Dr. Evgenia Ilyinskaya Credit: @EIlyinskaya)

Unexpected Elements looks for the science behind the news, and this week the news is glittery and pink with the release of the Barbie movie.

The movie has very pink aesthetic, so we get philosophical about the colour pink – does it actually exist and if so, how come it isn’t in the rainbow?

We also discover how this iconic doll has performed some actual valuable science, helping cryogenic researchers design space suit technology to help future missions to the moon.

In Ask the Unexpected this week we’ve got dog science as we answer the age old joke: how does my dog smell? Terrible, obviously, but it also depends on something called the vomeronasal organ..

And there are newcomers in Germany and they’re troublemakers. We hear how an unpleasant mosquito borne virus has arrived in northern Europe and consider whether climate change might be to blame.

All that plus your emails and WhatsApps, language pedantry and an ewaste dating service.

Presented by Marnie Chesterton Produced by Ben Motley, with Margaret Sessa-Hawkins, Alex Mansfield and Sophie Ormiston