Traditionally, our August talk is a little different: it's four of our members giving shorter talks on topics they're passionate about.

This year, we have:

• Simon's take on the natural fallacy in food health discourse, and why you should love e-numbers after all;
• Leah Callender-Crowe, on the Ask for Evidence campaign, the nature of good and bad evidence, and asking for evidence of claims in every day life;
• ‘Freedom of Information: What you need to know’ from Claire Elliott — Find out more about FOI, how to make a request, the exemptions and the funny side of FOI; and
• Dean Moore discussing the evidence for the health benefits of meditating and optimism, while deconstructing the superstitious and often dangerous claims made about these practices in New Age movements