science – Watch documentaries of all time

How One Company Secretly Poisoned The Planet

Albert — Wed, 14 May 2025 14:07:28 +0000

At its core, this documentary unravels the complex and alarming story of PFAS – per- and polyfluoroalkyl substances – a class of man-made chemicals that have become ubiquitous in our modern world. The film uses the accidental invention of Teflon by DuPont scientist Roy Plunkett as a starting point. Plunkett wasn’t trying to cure blindness, nor did he invent a non-stick pan initially. He was working on refrigerants when he stumbled upon a strangely slippery, inert powder – Polytetrafluoroethylene, or PTFE, later trademarked as Teflon.

The documentary then meticulously traces how this “miracle” substance, along with the chemicals used to manufacture it, specifically PFOA (also known as C8), proliferated. It explores its myriad applications, from non-stick cookware and waterproof clothing to firefighting foam and industrial uses. However, the central argument, and the “blindness” connection, isn’t literal. Instead, it refers to a kind of corporate blindness and societal ignorance regarding the potential long-term health and environmental impacts of these incredibly persistent “forever chemicals.” The film investigates how these substances entered our environment and our bodies, and the decades-long journey of uncovering their harmful effects, often in the face of corporate denial or downplaying of risks.

Veritasium’s signature style is on full display here, and it’s incredibly effective.

:The documentary masterfully blends archival footage – vintage advertisements for Teflon, old industrial films from DuPont and 3M, news clips – with crisp, modern-day interviews and compelling animations. The archival footage is particularly powerful, showcasing the initial enthusiasm for these chemicals without any understanding of their downsides. The animations are a standout, making complex chemical processes (like polymerization, covalent bonds, and the behavior of surfactants) remarkably clear and accessible to a lay audience. Scenes like the animated depiction of Roy Plunkett’s accidental discovery or the explanation of how C8 acts as a surfactant are both informative and visually engaging.
The editing is sharp and keeps the narrative moving at a brisk but digestible pace. The film expertly weaves together historical timelines, scientific explanations, and personal stories (like that of farmer Earl Tennant and lawyer Robert Bilott). The pacing builds suspense as the story of PFAS contamination unfolds, mirroring the slow dawning of awareness about the problem.
Derek Muller’s narration is, as always, excellent. He’s a clear, authoritative, and engaging guide through complex scientific and historical terrain. The interviews are crucial and well-chosen. Robert Bilott, the environmental lawyer who spent decades fighting DuPont, provides a powerful and credible firsthand account. The inclusion of experts like Andrew Patterson and the CEO of Puraffinity (Henrik Hagemann) adds scientific depth and a forward-looking perspective on potential solutions.
The music is generally subtle but effective, often creating a sense of underlying unease or highlighting moments of revelation. It never overwhelms the information being presented.

The documentary excels in presenting a wealth of information with clarity and credibility.

The scientific explanations are broken down into understandable components. Concepts like the strength of the carbon-fluorine bond (making these chemicals “forever chemicals”) and the mechanism of bioaccumulation are well-explained. The historical timeline of DuPont’s and 3M’s internal knowledge versus public statements is laid out with supporting documentation.
The use of internal company documents, highlighted and annotated on screen, is a powerful tool for building credibility. These aren’t just assertions; they are backed by evidence. The interviews with key figures like Bilott, who directly accessed these documents, lend immense weight to the claims. The film also references peer-reviewed studies and reports from bodies like the National Academies of Sciences, Engineering, and Medicine.
The central argument – that these widely used chemicals pose significant health and environmental risks that were known or suspected by manufacturers long before public awareness – is highly persuasive. The evidence presented, particularly the internal memos and animal studies showing adverse effects, is compelling. The film builds a strong case for corporate negligence and a failure of regulatory oversight.
Multiple Perspectives/Counterarguments: While the film clearly takes a critical stance on the actions of companies like DuPont and 3M, it does briefly acknowledge the utility and initial “miracle” status of these chemicals. It also includes the perspective of companies like Chemours (a spin-off from DuPont) which are now developing alternative, supposedly safer chemicals (like GenX), though the film also raises questions about the safety of these new alternatives. The film doesn’t shy away from the complexities, such as the fact that PFOA itself is no longer used in Teflon production by major manufacturers, but the problem of existing contamination and the broader class of PFAS remains.

This documentary is both thought-provoking and deeply unsettling.

The story of Earl Tennant, the farmer whose cattle were dying from contaminated water, is heartbreaking and serves as a powerful human anchor to the larger scientific and legal narrative. Learning about the sheer ubiquity of these chemicals in everyday products and, consequently, in our own bodies, is alarming. It challenges viewers to reconsider the products they use and the trust they place in corporations and regulatory bodies.
Attention-Holding: Yes, absolutely. The combination of historical intrigue, scientific explanation, personal stories, and the unfolding legal battle keeps you hooked. Derek Muller’s engaging presentation style and the well-paced editing ensure there are no dull moments. The demonstration of taking his and Gregor’s blood samples and the subsequent results showing their PFAS levels make the issue very personal and relatable.

I liked :

- Exceptional Clarity: Complex science is made accessible.
- Strong Evidentiary Basis: Use of internal documents and expert interviews is highly effective.
- Compelling Narrative: The historical and legal battles are as engaging as the science.
- Visual Storytelling: The animations and archival footage are top-notch.
- Relevance: Highlights an ongoing and widespread environmental and health concern.
- Call to Awareness (if not direct action): It definitely makes you think about what’s in your water and products.
Bear in mind:
- Potential Overwhelm: The sheer number of PFAS chemicals and the scale of the problem could feel daunting, perhaps leaving some viewers feeling a bit helpless, though the film does touch on emerging solutions.
- Limited Focus on Solutions (initially): While it introduces Puraffinity’s work towards the end, the bulk of the film focuses on the problem. Some viewers might crave more depth on remediation or regulatory solutions earlier on.
- Company Rebuttals (Implicit): While internal documents are shown, a more direct, recent statement or interview from the companies involved (even if predictable) might have added another layer, though it’s understandable why that might be difficult to obtain or might derail the film’s focus.

Africa‘s tech pioneers – Innovative solutions for a sustainable future |

Albert — Thu, 27 Feb 2025 17:00:10 +0000

Ten of the world’s fastest growing economies are located on the African continent. Companies in the field of science and innovation are being promoted. Climate-friendly ideas for the future are already being realized in African countries.

Africa has the youngest, fastest-growing population of any continent. This is reflected in the innovative strength emanating from many African nations: young scientists in particular are being supported and are developing creative, climate-friendly strategies that have the potential to solve global problems.

At the same time, many African countries face immense challenges: political crises, wars, population growth and climate change. Solutions are being developed on a local level. In Kenya, for example, a team of young scientists has succeeded in using new technologies to reduce the price of animal feed production. Mobile communication solutions from Nairobi deliver knowledge and education in indigenous languages to the remotest regions of East Africa. Kenya and Uganda are already supplied with more than 90 per cent renewable energy. A young Afro-German entrepreneur in Kampala is taking advantage of this – he wants to expand e-mobility in private transport. The municipal healthcare system in Accra, Ghana, is already working with artificial intelligence developed in Africa.

However, climate change caused by industrialized nations in the northern hemisphere poses a particular threat to Africa. Of the almost 1.5 billion Africans from 54 countries, as many as 117 million people could be at risk from rising sea levels in 2030.

By 2100, Africa’s total population could be around 3.8 billion. One solution under consideration is to build a floating city in Lagos, Nigeria, that can adapt to the consequences of climate change.

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Should we bring extinct species back to life? |

Albert — Thu, 06 Feb 2025 17:00:27 +0000

All around the world, scientists are working to recreate lost animal species such as the mammoth. Using modern genetic techniques, they’re extracting ancient genetic material from museum exhibits. Do their efforts represent hope for the future of the natural world? Or is science playing God?

Findings in the thawed permafrost of Siberia have made it possible to reconstruct the DNA of mammoths. Researchers are now experimenting with inserting genes related to the ability to resist cold temperatures into the Asian elephant, which is related to the mammoth. The animals thus created could survive in the steppes of Siberia and Alaska.

In Australia, scientists have managed to extract the genetic material of marsupial wolves from preserved embryos in museums. The predator’s genes are replicated in the lab and implanted into the related marsupial mouse – in a bid to bring the extinct creature back to life.

And biotechnology could also help white rhinos in Africa: Researchers in Berlin are fertilizing eggs from the last two living females with sperm from deceased males frozen and preserved for decades.

However, these practices are also attracting criticism. Biology researchers question the usefulness of revived species for natural habitats. They fear that the excitement surrounding the idea of bringing back extinct species could distract people from the many problems that cause animals to disappear, in the first place. Are some scientists playing God – with unforeseeable consequences for the environment?

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Fake steak – Future-proof food and lab-grown meat |

Albert — Fri, 27 Dec 2024 17:00:05 +0000

All around the world, entrepreneurs and scientists are looking for a way out of factory farming. They’re concerned by the issue of animal welfare. But a primary motive is the ecological impact of industrial livestock farming.

Industrial livestock farming is responsible for around 15 percent of global greenhouse gas emissions. It also requires huge amounts of land and water and is thought to be contributing to the rise in antibiotic-resistant infections in humans. This is why more and more scientists and entrepreneurs are conducting research on alternatives to conventional meat production.

In California, Joshua Tetrick is working on a method of growing meat in a bioreactor. He multiplies the muscle cells of chickens in huge tanks and cultivates them with plant-based nutrients. The resulting cell pulp is molded into fibrous meat with the help of a plant scaffold. A kilo still costs many hundreds of dollars. But Joshua Tetrick hopes that production can be scaled up to a globally relevant level. After all, with ‘Good Meat’ he was one of the first two companies in the USA to receive a license for cultured meat.

At the University of California, Alison Van Eenennaam is trying to make meat production more efficient. Using the gene editing tool CRISPR she’s altered the genetic make-up of a cow so that its offspring are exclusively male. This is a great advantage, as male calves grow faster and consume fewer resources than female calves to produce the same amount of meat – thereby reducing the carbon footprint of livestock farming.

For Pasi Vainikka from ‘Solar Foods’ in Helsinki, these are all just intermediate steps on the way to a truly sustainable future food: he’s cultivating a whole new category of food in gigantic fermenters: Bacteria that are fed with CO2 and hydrogen and blended to create a product called ‘Solein’. A flavorless, protein-rich basic ingredient that can replace eggs and milk in practically all foods.

Science journalist Ingolf Baur meets some of the researchers and entrepreneurs seeking alternatives to industrial livestock farming around the world.

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Mars – Life on the Red Planet? |

Albert — Fri, 12 Apr 2024 16:00:43 +0000

In February 2021, the robot “Perseverance” landed successfully on Mars. However, this success was never a given. The film shows the difficult work involved in developing the robot, right up to its successful landing.

The new robot NASA sent to Mars is called “Perseverance”. Its mission? To search for evidence of past life on the Red Planet – an important and ambitious endeavor. It took years to design the space probe and its small helicopter drone, called “Ingenuity”. This documentary follows the rover’s development, right up to its landing in the Jezero Crater on February 18, 2021.

The mission proved to be a complete success: the robot landed safely and all the instruments on board functioned smoothly. As a result, “Perseverance” was able to deliver high-resolution images of Mars. But getting there was an arduous journey for all involved.

On site, “Perseverance” takes samples from the crater, which scientists believe was once a river delta. Geological traces of past life – so-called biosignatures – could be hidden in the rock. Eventually, these samples will be brought back to Earth for analysis. Among other things, they could provide insights into possible life on Mars.

The four-pound mini-helicopter “Ingenuity”, which traveled in the belly of the rover, is now carrying out a series of test flights. These are the first of their kind to be undertaken on another planet. Another task of “Perseverance” is to test an innovative technology for extracting oxygen from the atmosphere. It is hoped that the gas can be used as fuel — or to supply oxygen for future manned flights to Mars.

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How does touch affect our mental and physical health? |

Albert — Sat, 02 Apr 2022 16:00:08 +0000

Touch shapes us as humans. Indeed, touch is fundamental to what makes us social beings. Touch influences how we perceive stress and pain, who we trust and who we fear. How does this work? And what happens to us in the absence of touch?

Gentle touch is vital for us humans. It creates the first contact with the world for newborns, giving us a sense of security and belonging. Touch influences our immune system, and on our feelings for our fellow human beings. Especially strong feelings, such as love or compassion, can be better conveyed through touch than through words, facial expressions or gestures.

Given how important touch is, it’s no surprise that humans have a highly specialized system devoted exclusively to perceiving gentle touch stimuli. Why does the touch of a stranger feel so different to that of someone we are emotionally close to? What is happening in our brain – and what role does the brain play in all this?

In an era of social distancing, touch research is becoming increasingly relevant. How does it affect us, and our relationships, when we are required to keep our distance? Researchers explore what role touch plays in our physical and emotional well-being, and what the consequences are when touch is missing.

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Archeology – exploring the past with modern technology | DW History Documentary

Albert — Sun, 07 Oct 2018 15:00:06 +0000

Today modern archaeology often works with digital technology. Geophysics has allowed thousands of ancient sites to be located – a huge gain for science.

The dig is no longer the be-all and end-all of archeology. We accompany some archeologists on their journey into the virtual past. Geophysics comprises a range of techniques with various geological and military functions. Geomagnetism is used to locate enemy submarines or potential reserves of oil or other minerals. Now, German and Irish archeologists have teamed up to use it to trace prehistoric grave systems. Researchers in western Germany are applying it to locate ancient procession and pilgrimage routes. Shipping archeologists in Bremerhaven are availing of digital technology to create virtual models of shipwrecks and, in Berlin, archeologists and game designers have also embarked on a joint project. As luck would have it, they scanned every millimeter of a temple in the Syrian city of Aleppo, not suspecting that, soon afterwards, the complex would be largely destroyed in the country’s civil war. Their virtual model is evidence that the study of the past can have uses for the present, just as technologies of the present can help us to study the past.
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