In this talk the speaker demonstrates a selection of the patterns and skills of juggling while at the same time developing a simple method of describing and annotating a class of juggling patterns. By using elementary mathematics these patterns can be classified, leading to a simple way to describe those patterns that are known already, and a technique for discovering new ones.

This talk will be mostly beneficial for students over the age of 16 with an interest in mathematics.

Colin Wright graduated in 1982 from Monash University, Melbourne, Australia, with a B.Sc.(Hons) in Pure Mathematics, and went on to receive his doctorate in 1990 from Cambridge University, England. While at Cambridge he also learned how to fire-breathe, unicycle, juggle and ballroom dance. Since then he has worked as a research mathematician, a computer programmer, and an electronics hardware designer, taking time to give presentations all over the world on "Juggling - Theory and Practice." Colin also enjoys sailing small boats

]]>This talk presents how digital sound is represented in a computer (or an iPod) and how, by representing the digital sound by sine waves, apparent redundancies within the digital sound file can be readily identified and and then removed, without changing what is heard, but resulting in a much smaller file size.

Without this approach, Digital Radio, iTunes, ect. would not be commercially viable.

**Booking is essential: ereade@wit.ie or 051 302037**

Start date: 2 p.m. on October 16.

Description: The annual Hamilton walk commemorates Hamilton's famous creation of a new system of numbers called Quaternions on the banks of the Royal Canal on October 16, 1843.

Location: Dunsink Observatory.

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Contact for booking: It's necessary to book a place by calling Fiacre Ó Cairbre at (01) 7083763.