This week SUMS is holding a "lightning talk" event, where four speakers give short talks for 5-10 minutes each... followed by pizza. The speakers this week are USyd Honours/postgrad students. Somewhat self-explanatory titles are given below. "Hailstone Numbers" - Josh Ciappara "Non-Linear Chemical Dynamics" - Maggie Corrigan "Rational Tangles" - Sean Gardiner "Australia’s Next Top Statistical Model" - Kevin Wang