In this episode, Professor PJ Cullen, Chemical Engineering expert from the University of Sydney, breaks down the global nitrogen challenge. We explore why nitrogen is essential for life, the history of fertiliser - from the Guano Wars to the energy-intensive Haber-Bosch process - and how today's nitrogen production is harming the planet. Cullen introduces Plasma Leap, his startup using non-thermal plasma to mimic lightning and fix nitrogen sustainably. We also dive into the risks of nitrogen storage, the 2020 Beirut explosion, and the urgent need to electrify chemical industries.  https://www.plasmaleap.com/ Linkedin: PJ Cullen

In part two with Online Safety Consultant Troy Hunt (Have I Been Pwned), we unpack the risks of online age verification in light of Australia’s social media ban, including the personal data (often times photos or government documents) sites may demand, and how these security practices can be questionable.  Troy explains why we should be thinking more about data minimisation and the dangers of unnecessary data retention. We go through the safest multi-factor authentication methods, from SMS to physical keys, and Troy shares a personal phishing story, reminding us that no-one is immune to hacking thanks to increasingly sophisticated phishing techniques. https://haveibeenpwned.com/ Linkedin: Troy Hunt

In this episode, we’re joined by Troy Hunt, Australian online security consultant, creator of Have I Been Pwned, and one of the world’s leading voices on data breaches. He breaks down the key differences between encryption and hashing, and what they mean for keeping your data safe. We dive into infamous data breaches, including the Ashley Madison case, and explore the often hidden, long-term impacts these leaks can have on people’s lives. With online scams and breaches costing Australians over $3 billion every year, we also look at the rising threat of ransomware and why it’s so hard to fight. This conversation opened so many cans of worms, we had to save the rest for part two. https://haveibeenpwned.com/ Linkedin: Troy Hunt

In this episode, we sit down with Australian climate scientist Professor Sarah Perkins-Kirkpatrick to explore the story of climate science, how we first discovered the planet was warming, and what we now know about the forces driving it. Sarah breaks down the role of carbon dioxide in trapping heat like a planetary blanket and shares insights from her cutting-edge research on long-term climate modelling. What would happen if we stopped emitting CO₂ today? The answers are sobering, yet they also offer hope, underscoring why optimism remains essential in the fight for a livable future. Linked in: Sarah Perkins-Kirkpatrick https://www.21centuryweather.org.au/

I had the honor of sitting down with Professor Donna Strickland, Nobel Prize-winning physicist the third woman in history to receive the prestigious award in physics. In our conversation, we discuss her groundbreaking work in laser physics and the journey that led her there. From her early academic interests to the moment she received the life-changing call from the Royal Swedish Academy at 5AM (?!), Donna shares insights into her discovery of chirped pulse amplification (CPA), a revolutionary technique that changed the field of high-intensity lasers. We discuss the science behind CPA and the moment she accidentally broke the fibre optic cable required for her PhD research. Donna reflects on the role of perseverance, collaboration, and the underestimated metric of "luck” in scientific discovery.

In part two of our chat with Dr. Heather Ford, we delve deeper into the hidden dynamics of Wikipedia — the world’s largest encyclopedia and 8th most visited website, run largely by volunteers. We explore how pages are updated in real time, yet controversial topics like Indigenous place names often face delays and heated edit wars. Dr. Ford explains how this can lead editors to walk away, raising concerns about who gets to shape history. We also unpack the platform's lack of diversity and the growing influence of AI — with up to 90% of internet content projected to be AI-generated by the end of 2025. Connect with Dr. Heather Ford on Linkedin hblog.org

I'm joined by Dr. Heather Ford, ARC Future Fellow and Professor in the School of Communications at UTS, to explore the fascinating world of Wikipedia. Inspired by her article “We analysed 35,000 Wikipedia entries about Australian places. Some of them sanitise history” in The Conversation, we dive deep into the strengths and shortcomings of one of the internet’s most beloved resources. We unpack how Wikipedia works behind the scenes: who edits it, how “edit wars” break out, and why it remains such a radical platform — a place where history can be written in real time, sometimes even before events unfold. Together, we question whether Wikipedia offers an honest account of Australia’s past, particularly when it comes to Indigenous history. This is a two-parter so be sure to tune in next week for part 2. Connect with Dr. Heather Ford on Linkedin https://hblog.org/    

In part two of my conversation with Dr. Graham Wild, we dive deeper into the fascinating world of hypersonic machines. We explore how sound waves behave at extreme speeds, the significance of the boundary layer, and what materials are best suited for these ultra-fast aircraft. Connect with Dr. Graham Wild on LinkedIn Twitter/X: @AerospaceDoctor

Aviation expert Dr. Graham Wild returns to take us beyond the basics of flight and into the high-speed world of subsonic vs. hypersonic aircraft. We break down the engine mechanics behind these incredible machines, and I squeeze in a humblebrag about sitting in an SR-71 (yes, okay, it was grounded). It’s a theory-packed episode, so we’ve split it into two parts. Catch Part 2 next week. Connect with Dr. Graham Wild on Linkedin Twitter/ X - @aerospacedoctor

In 2020, Scientific American made waves with the provocative headline: "No One Can Explain Why Planes Stay in the Air." But is that really true? Dr. Graham Wild, senior lecturer in aviation science and technology at the University of New South Wales in Canberra, joins us to set the record straight. In this episode, we dip our toes into the complex of flight. We scratch at the very surface of the topic in an episode that could easily take over 20 hours. Connectt with Dr. Graham Wild on Linkedin Twitter/ X - @aerospacedoctor