A temporal paradox is a contradiction that arises when time travel allows actions in the future to influence the past. It challenges our understanding of cause and effect and fuels sci‑fi plots and thought experiments. 🧵⬇️ (1/4)

Holography turns light into a floating 3D image by capturing both its intensity and phase. Unlike a photo, which records light from one direction, a hologram shows how light behaves in space, letting you see different perspectives. 🧵⬇️ (1/4)

Your attention, please: You are allowed to eat ice cream for breakfast! Ice Cream for Breakfast Day began in 1960s Rochester, New York, when a mother cheered up her kids during a snowstorm. Today it's celebrated worldwide.  Scoop up more knowledge ➡️ w.wiki/HRYg

Looking for adventure? Start your rabbit hole with a truly random Wikipedia article ⬇️ No algorithm needed. One click sends you anywhere – from obscure villages to species of frogs. Experience serendipity without algorithms. Start your random adventure ➡️ w.wiki/_2n

How many of these history myths did you think were real? Catchy details and clean stories can quietly replace what evidence shows. From Vikings to Newton, Wikipedia’s list of common misconceptions debunks myths we’ve heard since childhood.  🧵⬇️ (1/8)

Miss Piggy, however, has always been a pig.

Kente cloth's vivid patterns reflect Akan and Ewe weaving traditions in Ghana. Narrow strips woven on looms are joined into cloths whose designs carry messages.  Learn how meaning is woven into kente cloth ➡️ w.wiki/5ckV

Peltophryne lemur, or sapo concho if you're nasty 🐸 The Puerto Rican crested toad is found only in Puerto Rico and the Virgin Islands. You might be more familiar with the charismatic toad thanks to Grammy-winner Bad Bunny. Hop into more knowledge ➡️ w.wiki/Hgwc

Abracadabra began as a protective charm in ancient Rome. Its roots may lie in Aramaic, Greek, or abraxas, but nothing’s certain. Over time, it shifted from healing amulet to the go‑to magic word on stage. Reveal the history behind this famous spell ➡️ w.wiki/AvuJ

A hiking expedition shrouded in mystery, 65 years later. On 1 or 2 February 1959, experienced Soviet hikers died in the northern part of the Ural Mountains ridge under undetermined circumstances. Uncover the truth ➡️ w.wiki/Geg

January Wikimedia Commons photo dump 📸 If you visit Wikipedia's homepage, every day you will see a "Today's featured picture" taken from Wikipedia's sister project Wikimedia Commons – like the ones you see in this post. Explore more ➡️ w.wiki/HdMs

Trash cans, ladders, ironing boards, traffic cones: would you use any object to save your spot?

Happy International Puzzle Day! Wikipedia’s jigsaw globe reminds us that knowledge grows piece by piece, built by people around the world. The gap at the top means there’s always room for new information and voices. Piece together more knowledge ➡️ w.wiki/d6g

Ĉu vi sciis, ke ekzistas Esperanta versio de Vikipedio? A constructed language or "conlang" like the Esperanto above is deliberately designed rather than naturally evolved. Some are made to communicate, others – like Elvish or Klingon  – are fictional. Lernu pli ➡️ w.wiki/5kbR

Artists have paired logic and aesthetics for centuries, using geometry and ratios to unlock beauty.

Pre-order Baby Globe ➡️ www.makeship.com/products/bab...

Whales weigh tens of tons, and when they die on a beach, things can get messy. Gas builds up inside the carcass as bacteria break down tissues. Sometimes authorities use explosives, with infamous results like the 1970 Oregon blast. Build up your knowledge ➡️ w.wiki/_p282

Cat sleeping positions. Tea leaves. Cheese. People seem to have tried just about everything to predict the future. Across cultures and centuries, divination blends ritual, intuition, and symbolism to glimpse the unknown 🧵⬇️ (1/5)

Did you know that the first biographical article about a woman on Wikipedia was about Rosa Parks? Her refusal to give up her seat in 1955 sparked the Montgomery Bus Boycott and helped end bus segregation in the US. Learn more about her legendary act ➡️ w.wiki/3P

Meet the people behind Wikipedia: building, protecting, and expanding knowledge for everyone #Wikipedia25

Have you met the Wikipede? In another universe, maybe it has been Wikipedia's logo for over two decades. Community members submitted many designs, proposed changes, and debated them openly 🧵⬇️ (1/5)

Meet Jimmy, who dreamed up Wikipedia and watched humanity turn it into a global public good #Wikipedia25

Meet Yuriko, who brings knowledge from the past into the present so more people can learn from it #Wikipedia25

Meet Mireia, who works to bring Brazil’s diverse history into Wikipedia so more stories are seen #Wikipedia25

Meet Maxime, who is turning artifacts and architecture into shared knowledge for everyone #Wikipedia25

Meet Goodness, who champions the nuances of the Igbo language so Nigerian traditions can live on #Wikipedia25

Today, we celebrate the 25th anniversary of @wikipedia.org, which for a quarter of a century has been collaboratively built by unpaid strangers on the internet.

Meet Gabe, who updates photos on Wikipedia with images that truly represent Black culture #Wikipedia25

Meet Joanne, who noticed an influential historical woman was missing on Wikipedia and took action #Wikipedia25

Meet Netha, the Wikipedia editor who quietly debunks medical myths for millions #Wikipedia25

Meet Andrew, the Wikipedia editor chasing hurricanes for two decades straight #Wikipedia25

Have you ever watched something disappear while it is still there?  Fix your eyes on a point, and stationary images in your peripheral vision may fade after a few seconds. This illusion, called Troxler’s fading, was first described in 1804 by Swiss physician Ignaz Paul Vital Troxler. 🧵⬇️ (1/2)

The name Peter "rocks". Literally. It comes from the Greek word meaning "rock" and has been borne by saints, emperors, musicians, cartoon characters, and athletes 🧵⬇️ (1/5)

Where does the world's annual monthlong break from booze come from?  Dry January is a campaign by the charity Alcohol Change UK asking people to skip alcohol for the month. It also fits into a wider trend of Gen Z youth drinking less.  Sip some sober knowledge ➡️ w.wiki/GYCk

A simple experiment can make your brain think a rubber hand is its own: hide your hand and stroke a fake one in sync and you'll feel like the rubber hand belongs to you. This illusion shows that our sense of self is flexible. Use a rubber hand to click this link and learn more ➡️ w.wiki/GYEi

Feeling stressed? The ancient Stoics might have advice. Founded around 300 BCE, Stoicism teaches that virtue, reason and self‑control are the path to a good life and that we should focus on what we can control. 🧵⬇️ (1/2)

Does digital information feel permanent to you? Well, it isn't. A 2023 study found that in just 10 years' time, 38% of pages from 2013 went missing and 23% of news articles linked to a dead URL.  Learn more by clicking this functioning link ➡️ w.wiki/hrU

Ever notice those waving cats put in shop windows for good luck? These are the maneki‑neko. But where do they come from?🧵⬇️ (1/5)

What would make you sprint into the ocean in cold weather? Around the world, people hold polar plunges as rites of passage and to raise money for charity. Plunge into more knowledge ➡️ w.wiki/GYCK

When clocks strike midnight on the first day each year, a quiet creative revolution starts as hundreds of works move from private control into the public domain, unlocking stories, songs, and images for anyone to reuse. The world celebrates this big moment with an official Public Domain Day. (1/2)

🗣️ LET’S MAKE CURIOSITY COOL IN 2026

Meet clickbait's evil twin.  The concept of rage-bait has been used since at least 2009 to describe a form of click-bait that relies on manipulating users to respond angrily to offensive, inflammatory headlines, memes, tropes, or comments. Calmly learn more ➡️ w.wiki/GUwV

Before Barbie, there was Bild Lilli, a 1950s German doll based on a comic strip and made for adults. Her design inspired Mattel’s Barbie, showing how one idea can evolve from novelty to global icon. Explore the Bild Lilli world ➡️ w.wiki/FSwo

Forget Santa. In Iceland, the Yule Cat judges your outfit 🎅🏼 Jólakötturinn is said to roam snowy fields at Christmas, devouring anyone who hasn’t received new clothes before Christmas Eve. 🧵⬇️ (1/3)

Wikipedia is built by humans. Every day, volunteers from all over the world add to the sum of all human knowledge. One edit, one citation, one byte of data at a time.

When the longest night arrives, Iranians answer with pomegranates and poetry. Yalda Night marks the winter solstice, when families share fruit, recite Hafez, and turn darkness into celebration. Celebrate Yalda Night by learning more ➡️ w.wiki/FSwk

Free knowledge sounds good in any language. Over the course of 2025, volunteer editors made a total of 78,952,894 changes on 300+ different language editions of Wikipedia.

Christmas Day is fast approaching... At least in some places 🎄 Find your newest Christmas tradition on Wikipedia ➡️ w.wiki/8asw

Long before we could share our faces on Instagram, the Olmec carved stone head-portraits of their leaders. These colossal heads date from at least 900 BCE and range from just over a meter to more than three meters in height. 🧵⬇️ (1/4)

25 years of debate, discussion, and understanding. Consensus isn’t easy, but it’s human. Donate now ➡️ donate.wikipedia25.org #Wikipedia25