Did You Know

[Did You Know @Didyouknow_]

Why do some perfumes last all day while others seem to disappear after just a few hours?

One of the biggest factors is fragrance oil concentration.

Eau de Toilette (EDT) typically contains about 5–15% fragrance oil, making it lighter and fresher but generally shorter-lasting.

Eau de Parfum (EDP) contains around 15–20%, giving it a richer scent that usually lasts much longer.

Parfum, sometimes called Extrait de Parfum, contains roughly 20–30% fragrance oil. Because it's more concentrated, just a small amount can last for many hours.

Some brands also offer Elixir versions with concentrations above 30%, creating an even deeper and longer-lasting fragrance.

That said, concentration isn't the whole story. Ingredients, skin chemistry, the weather, and where you apply the fragrance all play a role in how long a perfume actually lasts. A well-made Eau de Parfum can sometimes outlast a poorly formulated Parfum, even with a lower oil concentration.

[Did You Know @Didyouknow_]

This isn't a real volcano. It's a classic chemistry demonstration known as the ammonium dichromate volcano.

When ammonium dichromate is ignited, it rapidly decomposes in an exothermic reaction, releasing heat, nitrogen gas, water vapor, and a cloud of green chromium(III) oxide. As the gases escape, they push the green ash outward, creating an eruption that closely resembles a miniature volcanic explosion.

The dramatic effect made this experiment a favorite in chemistry classrooms for decades.

However, it's rarely performed today because ammonium dichromate contains hexavalent chromium, a highly toxic and carcinogenic substance. Modern science demonstrations often use safer alternatives that produce a similar visual effect without the same health risks.

[Did You Know @Didyouknow_]

It's almost impossible to understand the true scale of the Great Pyramids until you see people standing beside them.

The Great Pyramid of Giza originally stood about 146.6 meters (481 feet) tall and was the tallest man-made structure on Earth for nearly 4,000 years. It's estimated to contain around 2.3 million limestone and granite blocks, with many weighing several tons each.

Despite being built more than 4,500 years ago, the pyramid's alignment is so precise that its sides are almost perfectly oriented to the cardinal directions.

Even today, the sheer size and engineering behind the Great Pyramid continue to puzzle historians, engineers, and archaeologists, making it one of the greatest construction achievements in human history.

[Did You Know @Didyouknow_]

Beneath the hills of Kentucky lies the longest known cave system on Earth.

Known as Mammoth Cave, it has more than 430 miles (690 km) of explored passageways, and explorers continue to discover new sections almost every year. Scientists believe the full network could be much larger than what's been mapped so far.

The cave is filled with vast chambers, underground rivers, rare rock formations, and wildlife that has adapted to complete darkness over thousands of years.

Even after decades of exploration, Mammoth Cave still hasn't revealed all of its secrets, making it one of the most remarkable natural wonders in the world.

[Did You Know @Didyouknow_]

Many travelers walk past this sleeping man without realizing he isn't real.

He's actually "The Traveler," a hyper-realistic sculpture that's been surprising passengers at Orlando International Airport since 1985.

[Did You Know @Didyouknow_]

The Solar System isn't just spinning around the Sun. It's also racing around the center of the Milky Way.

Traveling at roughly 828,000 km/h (514,000 mph), our Solar System takes about 225 to 250 million years to complete a single orbit around the galaxy. This journey is known as a galactic year or cosmic year.

To put that into perspective, when dinosaurs first appeared on Earth around 230 million years ago, the Solar System was in nearly the same region of the Milky Way that it's passing through today. Since then, we've completed only about one full orbit around the galaxy.

And even that's only part of the story.

As the Solar System circles the Milky Way, the galaxy itself is moving through space, while the entire universe continues to expand. Nothing in the cosmos is ever truly standing still, even if it feels that way from Earth.

[a w p @awpdaps]

https://t.co/T8qr3AdNLr The would've saved me so much trial and error

[a w p @awpdaps]

https://t.co/iJxypcXCVO America 250 LIVE: President Trump's BIG Speech at July 4th Freedom 250 Celebration in DC | N18G

[Did You Know @Didyouknow_]

An elderly man reportedly turned down a $220,000 offer to leave his home, so engineers built a highway around it instead.

Cases like this are known as "nail houses" in China. The term refers to homes that remain standing while everything around them is demolished for new developments, much like a nail that refuses to be hammered down.

When negotiations between homeowners and developers break down, construction doesn't always stop. In some cases, roads, highways, or even bridges are redesigned to go around the property, leaving a single house surrounded by traffic.

For some owners, it's about believing the compensation is too low. For others, it's about protecting a family home with decades of memories.

As strange as these houses look, they're a reminder that even massive infrastructure projects sometimes have to adapt when one person refuses to move.

[Did You Know @Didyouknow_]

Did you know?

That little head bump your cat gives you isn't just asking for attention.

It's a behavior called bunting, where cats gently press or rub their heads against people, other cats, or even furniture to leave behind their scent. Cats have scent glands around their forehead, cheeks, and ears, and this is one of the main ways they recognize what's familiar and safe.

When your cat head-butts you, it's marking you as part of its trusted social group. In the feline world, sharing the same scent helps strengthen social bonds and creates a sense of belonging. It's their way of saying, "You're one of us."

Behaviorists also believe bunting is a sign of trust. Cats only do it when they feel comfortable and secure, so if your cat regularly bumps its head against you, it's a good sign that it feels safe in your presence.

So the next time your cat gives you a gentle head bump, remember that it's more than just a cute habit. In cat language, it's one of the closest things to saying, "You're family."

[Did You Know @Didyouknow_]

Every morning, workers prepare fresh noodles, green onions, fish cakes, and tempura shrimp by hand. Each bowl is assembled in advance and loaded into the machine, ready for the next customer.

Insert a few coins, and the machine gets to work. It fills the bowl with boiling water to cook the noodles, spins it to drain the excess water, then pours in rich hot dashi broth. Just minutes later, your meal is ready.

Some locations even serve curry rice automatically. The machine positions a plate of rice, slices open a sealed curry packet, pours the sauce on top, and serves it fresh.

The most impressive part isn't the automation.

It's that many of these machines have been doing the exact same job since the 1970s, making them one of the oldest everyday technologies still quietly working across Japan

[Did You Know @Didyouknow_]

☄️ An asteroid bigger than the Empire State Building just flew past Earth.

Asteroid 152637 (1997 NC1) made its closest approach at around 7:14 a.m. EDT on June 27 - and there was zero risk of impact.

NASA estimates it's about 3,100 feet (950 m) across, more than twice the height of the Empire State Building. It passed roughly 1.6 million miles (2.6 million km) from Earth while traveling at nearly 20,000 mph.

Asteroids this large only make close flybys every few years.

Most are completely harmless - but that's exactly why space agencies constantly track near-Earth objects, so if one ever isn't, we'll know long before it arrives.

[Did You Know @Didyouknow_]

@zackchaerul Aspal cair. Makanya tankernya dipanasin terus biar nggak keburu mengeras.

[Did You Know @Didyouknow_]

Ever wondered why they heat asphalt in tankers?

At first, it seems unnecessary. After all, it's just a truck carrying asphalt.

But asphalt only behaves like a liquid when it's extremely hot. During transport, it's usually kept between 150 and 180°C so it can still be pumped out once it arrives.

The moment it starts cooling, it gets thicker and stickier really fast. Leave it long enough, and it can harden inside the tank. At that point, unloading becomes a nightmare, and the whole tanker may need to be heated again before anything can come out.

That's why those tankers stay hot for the entire trip. They're not trying to make the asphalt hotter. They're simply stopping it from turning into a giant block of black rock before it reaches the road.

[Did You Know @Didyouknow_]

@BiggerPrinting Nah, banyak yang baru tahu bagian itu. Makanya tangkinya harus tetap dipanasin selama perjalanan.

[Did You Know @Didyouknow_]

@ffanifany Iya, kelihatannya sepele, padahal prosesnya lumayan ribet juga.

[Did You Know @Didyouknow_]

@unayycio Simpel, tapi ternyata ada alasan teknis di baliknya. Baru ngeh juga pas baca-baca.

[Did You Know @Didyouknow_]

@keinara151223 Iya, aku juga baru tahu pas nyari soal ini. Ternyata aspal dinginnya cepet banget bikin repot.

[a w p @awpdaps]

Meta unveils Brain2Qwerty v2

Meta has introduced Brain2Qwerty v2, an AI system that can reconstruct text typed silently from continuous brain siggrow, without needing the exact timing of each keystroke.

The model achieves 61% average word accuracy, with top participants reaching nearly 70%.

It works by processing raw MEG (magnetoencephalography) brain signals through an encoder, an Aligner that identifies word boundaries and embeddings, and a large language model that refines the final text output.

The system is far from consumer-ready. It relies on multimillion-dollar MEG equipment and still isn't accurate enough for everyday use.

However, Meta found that performance continues to improve almost logarithmically as more training data is added, with no signs of hitting a plateau. If that trend holds, noninvasive brain-to-text technology could become significantly more capable as datasets grow.

[a w p @awpdaps]

🤖 Anthropic launches Claude Sonnet 5

Anthropic has officially unveiled Claude Sonnet 5, its most agentic Sonnet model yet. It can plan multi-step tasks, use a browser and terminal, and complete workflows that previously required much larger models.

According to Anthropic, Sonnet 5 delivers performance close to Opus 4.8 at a significantly lower cost. Unlike earlier Sonnet models, it's designed to finish complex tasks end-to-end instead of stalling midway.

Early testers report that it can write tests to reproduce bugs, fix code, and even revert changes to verify the original issue, all with little to no guidance.

Anthropic also says Sonnet 5 hallucinates less, is more resistant to prompt injection, and does a better job of refusing harmful requests.

Claude Sonnet 5 is now the default model for Free and Pro users, and it's also available on Max, Team, Enterprise, Claude Code, and the API. Introductory API pricing is available through August 31.