Ancient Antibiotic Antidote


Despite the absolutely mind-blowing scientific developments we have witnessed in the last few decades, it seems like our ancestors still have the upper hand, as a 1000-year-old recipe for a treatment is effective against our worst medical nightmare: superbugs.

Bald’s Leechbook

If you can read Old English, this page from the Bald’s Leechbook will give you the recipe to fight the almighty MRSA

The instructions for said cure, found in the “Bald’s Leechbook” manuscript (written in the 9th Century), called for mixing garlic, leeks, wine, and bile from a cow’s stomach in a brass container, so that’s what scientists in Nottingham University, curious about the effectiveness of this old-fashioned procedure, prepared. There was one slight exception: brass containers are costly and difficult to keep bacteria-free, so instead they used a glass bottle and inserted brass sheets into the mixture hoping it would have the same effect. It was left for nine days to sit, producing a dominant garlic scent which filled the lab. But proof did eventually start to show that demonstrated this was more than child’s play: the bacteria that had been added through the soil in the garlic and the leek had been killed, meaning the solution was actually sterilising itself.

Originally, the concoction was thought out to treat styes (eyelash infections) which are caused by Staphylococcus aureus bacteria, supposedly working perfectly fine. But the reconstruction has now been tested on Methicillin-Resistant Staphylococcus aureus; the older, tougher sibling of the original bacteria and the mixture can still hold its ground. In an experiment using pieces of skin from infected mice, the centuries-old mixture cleared 90% of the MRSA infection; just as much as the standard modern antibiotic used for this type of bacteria.

What’s interesting to note is that only the mixture of all these compounds actually caused an effect on the bacteria. The scientists conducting this research carried out several repeats, each time changing the variables by using only one of the ingredients in a brass-containing water solution. By themselves, they were useless against MRSA, which was to expect because even though they all have some antimicrobial properties, this type of superbug is one of the hardest to kill. But when they were brewed together, they were able to almost completely massacre the culture. Although an explanation for why only their combined effects works is still missing, the frenzy of this wild event has caught many scientists from all around the world’s attention, and many experiments are currently being conducted in hopes of finding out the mechanism behind this ‘magical’ preparation.

This event just goes to show that although we may see most past scientists as delirious people who though the Earth was flat and there were only 5 elements, they still had some very promising ideas which should be remembered.

A great video on the matter you should watch if you’re interested is:

(Special thanks to reader pcawdron for sharing it)

Precious Faeces


Treasure hunters spend their lives looking for valuable objects like gold coins and silver ornaments in shipwrecks or archaeological sites, often involving dangerous stunts. But tonnes of precious metals are actually hiding in plain site, right where you wouldn’t expect them: in your faeces.

gold stuff

Who knows where this gold actually came from…

Many products we use in our day-to-day life, like shampoos and detergents, contain precious metals, which gather up in urban pipes. Or they can be found in the food and drink we consume and that, after a while, accumulates in our body until is removed by excretion, which also ends up in the sewage drains. So imagine if this process was carried out by thousands of people, all living together in a city. The amount of valuable elements in the sewage would be outstanding! And so has been confirmed in a study by the US Geological Survey that found out that the concentration of precious metals in a city’s sewage system is comparable to that in an actual working mine.

For example, in a single kilogram of ‘sewage slime’, you can find 0.4mg of gold and 28mg of silver, metals used in jewellery; 638mg of copper, a metal used in electrical wiring and 49mg of vanadium, which has important industrial applications. But in the larger scale of a whole city, it has been calculated that by all these metals being thrown into the sewers, up to £510 million a year are being lost in the UK.

In an attempt to profit from this waste, companies are starting to consider human faeces as a viable source of precious metals. It’d be quite a profitable venture for them, and much greener than traditional mining since instead of using hazardous chemicals in lands where they can contaminate a habitat, they are used in an enclosed factory. And although working with faeces sounds like an outrageous idea and a bad time, it has been done for many years now, as it is used to make plant fertilizers.

As a fortunate side effect, we would actually be making our excrements cleaner and therefore protecting the environment. Faeces not only contain gold and silver, but heavier metals like lead which can be toxic to an ecosystem. By processing our waste, we’d make sure that not only the valuable metals are removed, but the harmful ones too. This idea just gets better and better!

So who knows, maybe someday in the near future you will wear gold bracelets that come from your faeces, or phones with microchips made of components of our waste.

A Chameleon’s Colourful Secret


Chameleons are definitely one of the most fascinating creatures on Earth, and their characteristic colour changes, to camouflage themselves or gain the attention of their mates, can impress both kids and adults alike. As if their ability to change their appearance into anything they’d like wasn’t enough, the mechanism by which they do so could also be unique and worth some credit.

In nature, colours are usually produced by pigments: substances that have a specific colour. For example, our skin gets tan because of a pigment called melanin which darkens it. In chameleons, it was originally thought that they showed one colour because a pigment of that same colour covered their skin, and when they wanted to change colour, a pigment of a new colour just substituted the original one. But it has now been discovered that their colour change, contrary to popular belief, had nothing to do with pigments. It’s actually all because of crystals.

A chameleon’s skin has an outer layer full of specialised cells called superficial iridophores, which have tiny guanine crystals embedded that can reflect light at different wavelengths and so produce different colours. Guanine not only plays an important role for this process, but is also one of the four bases in our DNA, which code for all the substances in our body. When the chameleon wants to change colour, it simply twist these cells around so the distance between crystals changes, which causes the reflection pattern, and subsequently the colour it produces, to change.

chameleon coloured

Chameleon’s can express a wide variety of colours thanks to guanine crystals

This is a very smart design which saves the chameleons a lot of energy and resources on producing and transporting the pigments around. If the animal wants a bluish colour, it just needs to push all these crystals together. For a reddish/yellow colour, just spread them out.

The only thing yet to be discovered is how the chameleons actually modify the superficial iridophores’ shape. In the experiment they carried out to test this new theory, they used salt water to expand and contract the cells and see what effect this had on the colour. But the natural process in chameleons is not necessarily chemical, it could be mechanical. Finding out which one it is is the team from the University of Geneva’s new objective.

Either way, discovering the truth behind this ingenious technique is not only an interesting fact to know about, but could also have real-life applications, for example, in developing computer screens.

Prophetic Neurones


Being able to tell the future is a superpower that we have all wanted at some point or another in our life. And although it seems like science-fiction material, we actually do have this ability. Granted, it is not as accurate or far-reaching as we would like, but it is still quite impressive and useful at a smaller scale.

In our everyday lives, we often encounter situations where we need to predict what other people are going to do. These can range from normal conversations to arguments, or even playing games. It is precisely this last scenario which can be used to investigate how exactly we are able to foretell other people’s actions.

The game in particular is called Prisoner’s Dilemma, and the experiment consists of having monkeys play this game and examine any patterns in their actions. In this game, two people face each other with two options: either cooperate or refuse to work together. Every different combination of choices yields different results. For example, if one declines and the other cooperates, the one that declines gets a great reward, whereas the other doesn’t. If both cooperate, they both get a smaller reward. If both refuse to work together, they get the smallest prize. So to win the most in this game you have to be good at predicting what your opponent will do and acting accordingly.

A team at Harvard Medical School made monkeys play this game hundreds of times, but did it so that each time the monkeys could see what their companion had chosen. This way, they could base their decision for the next turn on what the opponent had done and predict how they could get the greatest reward.

anterior cingulate

Highlighted in yelllow is the anterior cingulate, where these ‘clairvoyant’ neurones are found

At the same time, their brains were monitored. Specifically, an area called the anterior cingulate, which has been shown to be involved in the decision making process. The results showed that some neurones in this area acted according to a pattern, depending on the decisions the monkeys took. But to make the results more reliable and make sure these cells were responsible, they used some exterior electrical impulses to inhibit them and prevent them from working correctly. By doing this, the monkeys became more selfish and refused to cooperate more often, even though tactically it made no sense, as it would result in a lower prize. Since confusing these neurones caused the monkeys to make different choices, especially involving disconnection from their partner and a lack of prediction of their movements, it is safe to say that the specific group of cells in the anterior cingulate have an effect on foretelling the future.

Although this theory has only been tested in monkeys, the process in humans is thought to work in a similar way, and studying it can help study social interactions between humans, in light of diseases such as autism.

The Infamous Dress


At the expense of becoming another sheep in the herd of humanity’s trends, today’s article is going to be about the dress that has invaded the Internet. For those of you who don’t know, ‘the dress’ is a picture of a dress taken at a wedding and published on Tumblr, where it proceeded to reach international fame due to an odd fact: different people see the dress being different colours. It may sound like a weird online hoax, but it’s just an optical illusion that causes some people to see the dress and white and gold, whereas others see it as blue and black. Recently, there have been many theories suggested to explain why this phenomenon happens (for example, because of bad eyesight), but it actually has nothing to do with our eyes, but rather, with our brains. If you’re curious, the actual dress is blue and black, but that doesn’t mean that those who see it in other colours have worse eyesight or worse brains, as you will see.

Think about it like this. When you see an object in the shade, you automatically assume it is of a lighter colour than it actually looks like because you know shade makes things look darker. Therefore, your brain unconsciously tries to compensate for by processing the image your eyes are supplying and making it lighter.

But shade is not the only way images can be distorted. It also happens at normal daylight. If you are observing a piece of paper right underneath the sun, you will be viewing it thanks to a yellowish light. Your brain is smart enough to detect the light has a slight colour of its own and will therefore modify the image and subtract some yellow from it. If, on the other hand, you are seeing the piece of paper with the sun blocked but still receiving light from the sky, the light will be slightly blue, so your brain will take that bluish undertone away.

With this image, it’s the exact same scenario. The dress can appear to be in the shade to some people, and exposed to sunlight to others. Depending on how you unconsciously interpret it, you will see the dress a specific way. Those who think the dress is in the shade will unconsciously think it is darker than it should be, so their brains modify the image and make it lighter. This results in light colours like white and yellow-gold to appear. Those who don’t see the dress in partial darkness keep the colours mostly the same and don’t process the image, making it blue and black.

Interestingly enough, some people see it one way sometimes, the other way other times, and even a mixture of the two! This is just caused by our brains varying the amount of modification they do to the image, and may also have to do with the quality of the screen the picture is being viewed through.

But despite all of this, if you ask me, the dress is obviously white and gold.

dressgate

What colour do you see this dress?