Jack Dorsey’s new Sun Day app tells you exactly how long to tan before you burn

Twitter cofounder Jack Dorsey is back with a new app that tracks sun exposure and vitamin D levels.

Sun Day uses location-based data to show the current UV index, the day’s high, and additional details like cloud cover, sunrise, and sunset times. Users can choose their skin type from six options and indicate their clothing, such as “light (shorts & t-shirt)”, then manually toggle when they’re in or out of the sun.

Based on this input, the app calculates how lo

The CEO of Ciena on how AI is fueling a global subsea cable boom

Under the ocean’s surface lies the true backbone of the internet: an estimated 870,000 miles of submarine cables that ferry over 95% of global intercontinental data traffic across every major ocean. These cables are critical infrastructure, carrying everything from our daily video calls to mul

AI therapy chatbots are unsafe and stigmatizing, a new Stanford study finds

AI chatbot therapists have made plenty of headlines in recent months—some positive, some not so much.

A new paper from researchers at Stanford University has evaluated five chatbots designed to offer accessible therapy, using criteria based on what makes a good human therapist. Nick Haber, an assistant professor

Elon Musk’s chatbot Grok searches for his views before answering questions

The latest version of Elon Musk’s artificial intelligence chatbot Grok is echoing the views of its billionaire creator, so much so that it will sometimes search online for Musk’s stance on an issue before offering up an opinion.

The unusual behavior of

How this Florida county is using new 911 technology to save lives

When an emergency happens in Collier County, Florida, the 911 calls go to one of the most high-tech communications centers in the U.S., where callers can send text and video from the scene to

How a ‘Shark Tank’-winning neuroscientist invented the bionic hand that stole the show at Comic-Con

A gleaming Belle from Beauty and the Beast glided along the exhibition floor at last year’s San Diego Comic-Con adorned in a yellow corseted gown with cascading satin folds. She could barely take two steps before a cluster of little girls stopped her for photos. As she waved one hand, her other delicately held a red flower with mechanized fingers. The kids stared. It’s not every day you see a fairy-tale princess with a cybernetic hand. Disney meets Skynet. But this being the epicente

Why 1995 was the year the internet grew up

The internet wasn’t born whole—it came together from parts. Most know of ARPANET, the internet’s most famous precursor, but it was always limited strictly to government use. It was NSFNET that brought many networks together, and the internet that we use today is almost NSFNET itself.

Almost, but not quite: in 1995, the government that had raised the internet from its infancy gave it a firm shove out the door. Call it a graduation, or a coming of age. I think of it as the internet g

What is quantum computing? Here’s everything you need to know right now

Computing revolutions are surprisingly rare. Despite the extraordinary technological progress that separates the first general-purpose digital computer—1945’s ENIAC—from the smartphone in your pocket, both machines actually work the same fundamental way: by boiling down every task into a simple mathematical system of ones and zeros. For decades, so did every other computing device on the planet.

Then

This IBM ThinkPad was astounding in 1995—and still is

Closed, it looks pretty much like any other laptop manufactured in 1995.

To be sure, it’s more compact than most—making it, in the parlance of the day, a subnotebook. But it’s still comically thick, standing almost as tall as four MacBook Airs stacked on each other. That height is required to accommodate multiple technologies later rendered obsolete by technological progress, such as a dial-up fax/modem, an infrared port, two PCMCIA expansion card slots, and a bulky connector for a

This IBM ThinkPad was astounding in 1995—and still is

Closed, it looks pretty much like any other laptop manufactured in 1995.

To be sure, it’s more compact than most—making it, in the parlance of the day, a subnotebook. But it’s still comically thick, standing almost as tall as four MacBook Airs stacked on each other. That height is required to accommodate multiple technologies later rendered obsolete by technological progress, such as a dial-up fax/modem, an infrared port, two PCMCIA expansion card slots, and a bulky connector for a


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