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When Socrates said 'the only true wisdom is in knowing you know nothing', it's safe to say the Greek philosopher probably wasn't contemplating how flush lavatories function. But today's book argues that from the particulars of porcelain plumbing all the way up to the complexities of our political and economic systems, we all know a great deal less than we think we do. Simon speaks to Professor Steven Sloman, a cognitive scientist at Brown University and co-author of today's book.

Are gilts the safe haven they were once thought to be? With interest rates set to rise, what are the prospects for the fixed interest bonds issued by the British government? Nikesh Patel, Kempen Capital Management's Head of Investment Strategy, joined Simon to discuss

Article 50 will be activated tomorrow but can it move markets? Or will other Brexit policies be more closely watched by investors? Michael Hewson, chief market analyst at CMC Markets, joined Share Radio's Ed Bowsher for more.

Tesco will pay a £129 million fine over its 2014 accounting scandal, plus provide compensation for some investors, while two major shareholders are opposed to the supermarket giant's takeover of wholesaler Booker. For more analysis Rodney Hobson, financial commentator, joined Share Radio's Ed Bowsher for more.

Personal campaigns have made a power-sharing government in Northern Ireland increasingly difficult. So what's next for the devolved administration at Stormont? Mick Fealty, editor of Slugger O'Toole, joined Share Radio's Ed Bowsher to discuss.

Ahead of Article 50's trigger, is the UK prepared for a 'no deal' scenario on Brexit? Plus Holyrood votes on another independence referendum for Scotland. John Rentoul, chief political commentator at the Independent, joined Share Radio's senior analyst Ed Bowsher for more on the day's politics.

On this edition of Track Record, Sue Dougan speaks with the Director of Subway, UK and Ireland, Sacha Clark.

Qatar will invest £5 billion in the UK over the next five years, investors said at conference today - is this a vote of confidence in post-Brexit UK? Plus UK airlines will face severe restrictions if a hard Brexit goes ahead, with warnings coming from the European Commission. ‎Rachel Winter, senior investment manager at Killik & Co, joined Share Radio's Ed Bowsher to discuss the day's major economic stories.

Tesco's been warned against its deal with wholesaler Booker, with two of its biggest shareholders saying the £3.7 billion price tag is too steep. Plus newly-merged bookmaker Ladbrokes Coral sees £200 million loss on merger costs. Daniel Thomas, deputy companies editor at the FT, joined Share Radio's Ed Bowsher.

Social media firms will be summoned before the Home Secretary on Thursday after it emerged the Khalid Masood sent an encrypted message via Whatsapp minutes before the Westminster attack. Amber Rudd claims efforts by firms to curb extremist content online have been inadequate. But what issues would be raised if tech firms were to open up their platforms? To find out Georgie Frost was joined by Ed Johnson-Williams, a campaigner for The Open Rights Group - which campaigns for internet privacy.