Technically Speaking | a science and engineering discussion

Technical short: nanoparticles

They're used in lots of things but you don't often hear about it. Antonia, Laura and Emma discuss their use in medicine for radiation therapy, electronics and sun screen. They also explain why these tiny particles are so interesting to scientists.

References:

The study about zinc nanoparticles and lung cells was summarised for the media in 2012 but advice from experts explains why you should wwar suncreen.

The Antibacterial Mechanism of Silver Nanoparticles and Its Application in Dentistry, published in the International Journal of Nanomedicine in 2020

The fascinating world of nanoparticle research, published in Materials Today in 2013

Nanoparticle-based radiosensitization strategies for improving radiation therapy, published in Frontiers In Pharmacology in 2023

A review on nanoparticles: characteristics, synthesis, applications, and challenges, published in Frontiers in Microbiology in 2023

Gold Nanoparticles as Radiosensitizers in Cancer Radiotherapy, published in the International Journal of Nanomedicine in 2020 

Biological mechanisms of gold nanoparticle radiosensitization, published in Cancer Nanotechnology in 2017

Do rebellions benefit from science?

Do you find activists like Extinction Rebellion and Just Stop Oil annoying or do you support their fervour? Laura, Antonia and Jasmin discuss whether there is any evidence that their disruptive tactics will convince companies and governments to take more drastic action to curb the climate emergency. They look at why people might join a cause and whether facts or emotion are the most powerful tool an activist can use to persuade.

The team mention a report from the Tyndall Centre for Friends of the Earth which shows that plans for expansion of air travel contradicted targets for greenhouse gas emissions and became the basis for a peer-reviewed journal publication and was also used by protestors at the Heathrow Airport Climate Camp in 2007.

They also mention expert insight from social scientists shared in a news article, a commentary in a journal and analysis of the anti-vaccination movement as well as how celebrities like Joe Lycett hold organisations to account.

Is the world really running out of sand?

We've seen lots of news stories about a global sand shortage but what's really going on? Ellie, Antonia and Laura (joined by Ellie's cat Sparkles) analyse the facts, look at what sand is used for, discuss the effect that sand supplies have on people and the environment and speculate on what should be done next.

Read some of the news coverage, digest some sandy facts explained using handy graphics, read the most recent report from the United Nations, or read the research that uncovers how sand mining is affecting porpoise.

What can experiments on rats tell us?

Many breakthroughs in medicine have been made from studying rats. Antonia, Laura and Ellie discuss several studies of rat behaviour that have mapped how parts of the brain work and discuss how the results could be applied to humans to develop prosthetic limbs or help recover memory after a brain injury. They look at studies where rats are tickled until they laugh, learn to drive cars, navigate virtual reality and perform a Jedi mind trick.

What is explosive?

Ever watch an action movie where someone is hurled across the screen during an explosion and wondered how likely that is? Antonia, Laura, Nick and Ellie talk about movie portrayals, nuclear weapons, disaster investigations, and exploding animals.

Technical short: Apex predators, asteroids and couch potatoes

In an earlier episode on apex predators we had a bit of a tech fail! Here's a big chunk of speculative conversation from Antonia, Ellie and Jasmin that that follows some sort of weird logic but somehow arrives at a sensible conclusion.

How good is direct air capture?

To help tackle the climate crisis, we'll need a lot of new technology to reduce the concentration of greenhouse gases in the atmosphere. Ellie, Jasmin and Laura share a load of facts about the chemicals, energy requirements and land use involved in technology to capture carbon dioxide from the air. They also look at how planting trees compares to this technology and answer questions from a live audience from the Engineering Development Trust about Taylor Swift's private jet and why we're spending money on projects that aren't tackling the climate emergency.

 

Read the review article that Laura mentions in the journal MRS Energy & Sustainability.

Can we live forever?

If you could take a pill to halt ageing and become immortal, would you? Laura, Jasmin and Ellie take a look at some long-lived species, discuss just some of the science behind ageing and decide, if they could, whether they'd want to stay in their biological bodies forever or upload themselves to live digitally.

Read more about the science stories they discuss:

• Determining how long the Greenland shark lives for
• Jonathan the tortoise
• Ming the clam
• Earth's longest living organism
• Some other long-lived animals and plants
• Benefits of intermittent fasting studied by Cambridge scientists
• Genetics studies based on a tiny worm
• https://dogagingproject.org/
• https://www.quantamagazine.org/cells-across-the-body-talk-to-each-other-about-aging-20240108
• Blue zones
• An anti-ageing pill for dogs

Read some of the books they've read:

• Jellyfish Age Backwards: Nature's Secret to Longevity
• The Code Breaker

Are humans an apex predator?

We've been around for a while and we have a lot of influence over our environment but are we really better than a lion or an orca? Antonia, Jasmin and Ellie discuss whether humans the top of the food chain or whether nature still does it better than we do.

What does it take to find a new species of animal?

You might be surprised to know that new species are discovered pretty much every day. Laura and Ellie talk about how these discoveries are made and debate whether it's easier to find an exctinct, fossilised species or one that's still alive.

You can send your spare pennies to our ko-fi fund to support the podcast here.

Read about the discoveries that Ellie and the team at IFL Science have reported on including the Carlsberg beetle, a dinosaur in Utah, a dinosaur hand, the golden mole, a fossilised baby turtle that was mistaken for a plant, and Attenborough's rediscovered echidna.

The Natural History Museum publishes annual stats on discoveries.

The article from Scientific American that Laura mentions is What Makes Us Different.