I once interviewed a deeply unpleasant man with strong views on why women and gay people did not belong in his church. It wasn't just his opinions that were strong – he delivered his diatribe of bigoted nonsense on breath so rank I was surprised it hadn't killed the floral decorations with which his church was liberally bedecked. It turns out that, while I could justifiably find fault with the man's views, he may not have been able to help his halitosis. Apart from poor oral hygiene, there are many things that can cause bad breath, some of which may require a trip to the doctor. And, because we like to be helpful for our readers, we can show you how to check how your own breath measures up.

I have a dear and very longstanding friend who suffers terribly with bipolar disorder, which has seriously affected both her career and home life. Having shared a flat with her back in the day, I could see at close hand how she her brain chemicals drove her from ludicrous, sleepless highs to crashing lows that could last for weeks at a time. But scientists are figuring out more about this debilitating condition all the time. Now researchers believe they have figured out the areas of the brain that can drive the dramatic mood swings that come with bipolar disorder.

A straw poll of friends in my local pub has revealed there is a roughly even split between those outraged at the Conservative election date betting scandal (Electiondategate anyone?) and those who have become so cynical about UK politics that they identify with the "they're all as bad as each other" tendency. But the latter attitude threatens to poison public trust in democracy And as we've seen elsewhere, this can be a very slippery slope. Sometimes these scandals are just the sign of a government that has run out of puff.

This week we worried about the possibility of microplastics finding their way into our bodies, we worried about the carbon footprint of avocados, and we marvelled at the aesthetics of the modern corset as modelled by Taylor Swift and Emily Blunt.

From our friends and colleagues in our global network, we took a look at what the science of robotics can learn from elephants' trunks, we got an update on the push for Catalan independence and Australia's former ambassador to Lebanon, Ian Parmeter, warns of the danger of an all-out war between Israel and Hezbollah.

Jonathan Este

Senior International Affairs Editor, Associate Editor

Dundanim/Shutterstock

Take my (bad) breath away – causes of halitosis and how to check whether you have it

Dan Baumgardt, University of Bristol

There’s more to bad breath than just poor oral hygiene. Halitosis can also serve as a diagnostic tool for various health issues – and can even tell others if you’re on a diet.

Jacob Lund/Shutterstock

Bipolar disorder: we’ve pinpointed the brain areas which drive mood bias

Hestia Moningka, UCL

Momentary shifts in mood profoundly alter the brain’s response to pleasure in people with bipolar disorder.

Shutterstock/Alamy/Zerbor/Mehaniq/William Barton

What the election date betting scandal really tells us about the state of British politics

Sam Power, University of Sussex

Why we shouldn’t let the actions of a few taint the reputations of an entire political class.

Kuttelvaserova Stuchelova/Shutterstock

Microplastics and nanoplastics have been found throughout the human body – how worried should we be?

Michael Richardson, Leiden University; Meiru Wang, Leiden University

Nanoplastics have been found in the brain, lungs, arteries, semen and placenta. But the harms are still unknown.

sirirak kaewgorn/Shutterstock

What actually makes avocados bad for the environment?

Thomas Davies, Lancaster University

Avocados are a thirsty crop with a carbon footprint that’s more than twice that of bananas.

More newsletters from The Conversation for you:

Ukraine Recap • Imagine climate action • Gaza Update • Global Economy & Business • Europe newsletter • Something Good

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