We take for granted the fact that, whenever we want, we can see an unbelievably detailed image of ourselves in the mirror🪞 But consider that for the majority of human history, you were never able to actually, really see yourself. A thread on the humble, magical mirror. (1/9)
The first mirrors were likely pools of still water or vessels that held reflective liquid, but in the Neolithic, we start seeing evidence for physical mirrors, like this incredible obsidian mirror from Çatalhöyük in Turkey, dated to approximately 7500-6400 BC. (2/9)
In the Bronze & Iron Ages, we see the rise of mirrors made from materials like bronze, in addition to stone. These required regular polishing but still didn't afford a super clear reflection. This could explain the biblical reference to seeing "as in a mirror, darkly" (3/9)
Over in Mesoamerica, mirrors were independently invented (neat!) and pop up in the archaeological record around 1500 BC. They served both decorative & supernatural purposes. The Maya are known to have made mosaic mirrors, like the one below, from pyrite. (4/9)
Early glass mirrors show up in the 1st century AD & are refined in the Middle Ages, when Venetians discover & monopolize a technique to coat glass mirrors with tin. This makes their republic fabulously wealthy, until the French commit industrial espionage & leak the secret. (5/9)
Mirrors have long held a unique grip on our imagination. What exactly are we seeing when we look into one? For many, mirrors were supernatural, powerful objects. D̶u̶m̶b̶l̶e̶d̶o̶r̶e̶ Johannes Hartleib, in 1456, recounted rumors of a mirror that reflected your desires to you (6/9)
Many believed mirrors could take your soul, just like they take your image. This led to practices like covering mirrors in the houses of the recently deceased & keeping infants away from their reflections. It's also commonly thought that breaking a mirror is bad luck. (7/9)
In many cultures, mirrors offered glimpses at a parallel world or visions of the future. Catoptromancy, divination by mirrors, shows up independently all over the world, and even in well-known fairy tales ("Mirror, mirror, on the wall..") (8/9)
Overall, a rather fascinating history & some fun facts to think about next time you spy yourself in a mirror! (9/9).
Sources:
The Mirror: A History, by Sabine Melchoir-Bonnet.
Moyer (2012) Deep Reflection: An Archaeological Analysis of Mirrors in Iron Age Eurasia.
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A few million years ago, our ancestors started walking upright. Big mistake! (Only slightly kidding). Bipedalism helped us a lot: it freed up our hands to use tools & engage in cool new behaviors. But it also came with a lot of costs, many of which we're still paying today (1/7)
First up: pain! My god, the pain. Usually in the back, knees, & ankles. These are some of the most common health issues & bipedalism is largely to blame. Walking upright places extra stress on our poor bodies, which are constantly aching under the strain & weight. (2/7)
Humans are also a massive fall risk. Bipedalism changed our center of gravity & point of contact with the ground, making it more likely that we'll topple over. This becomes way more dangerous in pregnancy. Look how much our spines have to arch to support the extra weight. (3/7)
I'm a developmental scientist who studies how children grow & learn across cultures. I'm also an American mom who feels the extreme pressure put on parents in the West. I'm here to offer you some parenting ANTI-advice — here are a few things you can worry less about: 1/🧵
First: not everything has to be "educational". It's truly completely okay (& indeed, good) for kids to play for the sake of play. They don't have to be learning the alphabet or animal noises. They can just do whatever silly thing they want to do. They are ALWAYS learning! 2/
Second: you don't have to put pressure on yourself to constantly teach them things. In fact, active & direct instruction from an adult is the rarest form of teaching in human history. Kids know how to learn in other ways — like observation — & they're extremely good at it. 3/
Protests continue in Iran today after #MahsaAmini's death in custody at the hands of the 'morality police' for violating the mandatory hijab laws.
How did we get here? The story is my family's story, and mine, too.
A personal history of women's oppression in Iran. 1/
Some background. It's 1952. Mosaddegh is the democratically-elected leader of Iran. Iran's oil is largely controlled by foreign interests. Mosaddegh fights back & dares to nationalize the Iranian oil industry. The West is angry; they organize a coup. 2/ npr.org/2019/01/31/690…
The coup succeeds in 1953. Great Britain & the US bring back the Iranian monarchy, putting Mohammad Reza Pahlavi in power. He quickly reverses course and gives split ownership of Iranian oil to Western companies. Just what they wanted. 3/
Slides are visual aids that assist your presentation. Anytime you put something on your slides, its primary purpose is to help the *audience*, not you.
Nothing should distract from your verbal presentation, it should only enhance it.
A mini-presentation on slide design. 1/
One common mistake is to clutter the slide with lots of text, which the speaker reads out to the audience, verbatim. This is a bit boring and inefficient. Condense down the text to the main question or point of the slide, and speak the rest. Scary, maybe, but you can do it! 2/
Refrain from using too many colors, texts, or animations. Again, these are more likely to distract the audience than they are to help them. Strip down slides to the key points, and make those clear. Do use animations to make items appear at the right moments. 3/
I didn't want to dignify this with a response but this thread is toxic — filled with inaccuracies, stereotypes, & the dumbest takes possible. I think almost every single point is wrong, actually, & extremely harmful.
Anthony, if you had any sense, you would delete this. 1/
First of all, the trope that hunter-gatherers are "wild humans" is flawed, harmful, & condescending, and the idea that they have "full genetic expression" is literally so stupid I don't even know where to start. They're.. expressing more genes than us? 2/
That actually sounds to me like "we only use 10% of our brains". It's just nonsense. Genes are differentially expressed all the time, everywhere, and are constantly responding to input from the environment. This belies a massive misunderstanding of genetics. 3/
When imagining the past, people tend to forget that a huge portion of the population was made up of children — playing, learning, getting into mischief, & sometimes even making art. Here are a few lovely & lively examples of children's art from the historical record 🧵 1/
First up are these (newly discovered!) tiny handprints, found in Tibet & dated to around 200,000 years ago. They seem to be intentionally made by at least two kids — probably between 7-12 years old — who found a layer of soft travertine & decided to leave their marks 🤚 2/
In the 1st century AD, a Roman child used a stylus to carve this little stick figure into a wall in Pompeii. More than half of children's graffiti in Pompeii can be found in public, suggesting kids had active lives outside of home & lots of access to public spaces. 3/