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Issue 44 of Plus is now out! - http://plus.maths.org What's the risk of climate change or passive smoking? Why do penguins rotate their eggs? Is nature lazy? And how did we evolve the maths behind these questions? Find some answers in this political, psychological, philosophical and physical issue of Plus, and do some real sums with our interactive checker board. Understanding uncertainty David Spiegelhalter gives us his take on risk and uncertainty http://plus.maths.org/issue44/features/spiegelhalter/index.html Evolutionary maths How did we evolve our capacity for maths? And what's it got to do with language? http://plus.maths.org/issue44/features/varley/index.html Frugal nature: Euler and the calculus of variations This article continues our series on the work and life of Leonhard Euler and finds a strange law of nature http://plus.maths.org/issue44/features/wilson/index.html Arithmetic, bones and counting Make your own calculator with paper, pen, glue and some wooden rods -- and do some binary arithmetic with our interactive checker board http://plus.maths.org/issue44/features/sangwin/index.html Plus leaves the classroom Former editor Helen Joyce looks back over her time at Plus http://plus.maths.org/issue44/features/joyce/index.html Career interview: Business development manager, Smith Institute Claudia Centazzo tells Plus how maths can help with a huge range of real-life problems, from penguin eggs to ice cream bubbles. http://plus.maths.org/issue44/interview/index.html Also in this issue: Teacher package: Mathematical modelling This issue carries the second installment of a new feature in Plus: the teacher package bringing together all Plus articles about a particular subject from the UK National Curriculum. This time we look at mathematical modelling. We've classified the articles according to the depth of the maths content, so teachers and students can take their pick from articles that contain explicit calculations and proofs, those that give the bigger picture, and those that have explicit maths, but require the reader to fill in some gaps. Have a look! http://plus.maths.org/issue44/package/index.html But wait, there's more! Try a greater than sudoku, http://plus.maths.org/issue44/puzzle/index.html Find out how complexity emerges from simplicity, http://plus.maths.org/issue44/outerspace/index.html And marvel at some mathematical lives, http://plus.maths.org/issue44/editorial/index.html Plus all the latest mathematical news and reviews. Happy reading from the Plus team ********** If you received this message you have subscribed yourself to the PLUS-ANNOUNCE mailing list via our website. If you do not wish to remain on the list please visit http://www.jiscmail.ac.uk/cgi-bin/wa.exe?SUBED1=plus-announce&A=1 and follow the instructions to leave the list. If you have any comments on this newsletter, or Plus Magazine, please contact us at [log in to unmask] - we are always happy to hear from our readers! Feel free to forward this email to anyone you think might be interested.