How Byzantine Greek fire grenades worked

The shifting patterns of light on the seafloor are known as caustics. They form when sunlight is refracted and reflected by the constantly moving surface of the water, which acts like a dynamic magnifying glass that focuses and redirects the light into bright, dancing shapes. [📹 danhlegend]

The F-35B can hover like a helicopter and transition to forward flight like a jet, enabled by its advanced lift system developed by Lockheed Martin. The design allows short takeoffs and vertical landings while maintaining the speed and performance of a conventional fighter. [🎞️ intelligencego]

China has unveiled a new maglev train capable of reaching speeds of 600 km/h (373 mph), making it the fastest train in the world. The system could cut travel time between Beijing and Shanghai to around 2.5 hours. Using magnetic levitation technology, the train is designed to be ultra-quiet, highly efficient, and produces zero direct emissions.

Something every adult should learn to protect a child

Level of creativity = 1000

In 1977, Pradyumna Kumar Mahanandia cycled all the way from India to Sweden to reunite with the woman he loved, Charlotte von Schedvin. The remarkable journey took him across eight countries and lasted about four months. Nearly five decades later, the couple remains happily married.

Might be the cleanest robot dance ever recorded [📹maykonreplay]

Why Egyptians smeared honey on wounds

A Chinese team took an AI assistant with 430,000 lines of code that needed a $599 Mac Mini and 1GB of RAM… and rewrote the entire thing in Go so it could run on a $9.90 board with under 10MB of memory. Boot time: from 500 seconds to 1 second. Cost: from $599 to $9.90. Memory: from 1GB to 10MB. And the wildest part: 95% of the new code was written by AI agents. Humans only guided the architecture. 7,400+ stars on GitHub in just 4 days. This is the future: every AI technology that starts out expensive gets commoditized within months. The moat isn’t access to the technology — it’s what you DO with it.

A baby was filmed sitting on the porch, contemplating nature in absolute silence.

Riding down the the Passo della Croce Arcana, Italy.

This guy jumps onto a moving horse, balances as it gallops, and then starts jump roping while standing on it. Not exaggerating.

Happy Valentine's Day from Las Vegas

Namcha Barwa rising above autumn forests in the Himalayas

Lichtenberg figures are a branching electric discharge that sometimes appears on the surface of insulating materials. They can also be produced on wood with particularly pleasing aesthetic results.

A sea of cherry blossoms floating above the clouds

Unreal view that feels almost dreamlike

One of the most unforgettable moments of 2025 was captured by none other than Tahiti’s own.

El Capitan in Yosemite national park