High school students who use Generative AI to prepare for math exams perform worse on tests, where they can't rely on AI, than those who didn't use the tools at all, a new study shows.

Why it matters: A "personal tutor for every student" is one of the rosy scenarios AI optimists paint, but AI-driven learning still has many hurdles in its way.

The Greenland Ice Sheet saw a sharp spike in the rate and extent of melting last week, with 18 billion tons of water running into the North Atlantic in just three days. Satellite photos reveal melt ponds dotting the ice cover, particularly near the coasts.

Why it matters: Greenland's melting ice is the top annual contributor to global sea level rise. How much of and how quickly the ice sheet is lost will determine the fate of coastal cities from Hong Kong to Miami.

Mark last week as the end of the social networking era, which began with the rise of Friendster in 2003, shaped two decades of internet growth, and now closes with Facebook's rollout of a sweeping TikTok-like redesign.

The big picture: Under the social network model, which piggybacked on the rise of smartphones to mold billions of users' digital experiences, keeping up with your friends' posts served as the hub for everything you might aim to do online.

Giant restaurant chains like KFC and Boston Market are making big-splash introductions of chicken nuggets on their menus this month, setting up a potential rematch of the epic chicken sandwich wars of 2019.

Why it matters: With chicken consumption on the rise , fast food industry titans think they can boost profits by catering to the nugget-loving tastes of younger consumers — who favor easy-to-grab finger foods and view dinosaur-shaped fare as a cultural touchstone.

Apple Music and Spotify dedicated much of their day to celebrating Beyoncé's new album.

Why it matters: It's been six years since her last solo album, " Lemonade ," which made her the highest-paid musician in the world that year.

As Democrats enter a crucial week in their bid to pass a huge health care bill without Republican votes, they have yet to decide how to target hundreds of billions of dollars in spending — a call heavily dependent on politics and Senate rules.

Why it matters: The party seems willing to do whatever it takes to lower prescription drug prices and prevent massive Affordable Care Act premium hikes in the fall. What else — if anything — can be included in the package will depend on how much money they have available, and how much of that Sen. Joe Manchin is willing to spend.

Good afternoon, and welcome to our Modern Money & Markets Deep Dive series. This edition is a guide to digital currency, led by Axios Crypto authors Brady Dale and Crystal Kim.

Russia’s Gazprom said Monday it will halt another turbine engine in the Nord Stream 1 pipeline this week, which will further reduce natural gas flows to Germany.

Why it matters: The halt, which will reduce natural gas flows to only 20% of the pipeline's capacity starting July 27, comes just days after Gazprom resumed sending gas to Europe after a 10-day shutdown for maintenance.

The housing slowdown we've been anticipating for months is here.

The big picture: Home sales are slowing down, and some of the pandemic era's hottest " Zoomtowns " — sleepy areas where remote workers pushed up real-estate prices — are already seeing price drops.

European Union countries on Tuesday approved a plan to curb their natural gas consumption this winter in preparation of expected supply cuts by Russia.

Driving the news: EU energy ministers approved a proposal to reduce 15% of gas from August to March.

Uber says customers are enthusiastic about the ride-hailing company's newest option — Comfort Electric — which allows them to summon a ride in a Tesla or other premium electric car.

There's only one problem: Some Uber riders can't figure out how to operate the door handle of a Tesla, which lies flush against the car's body.

A new generation is dramatically reshaping the internet — rejecting and rebuking the social networks they grew up with, which barely resemble themselves anymore .

Why it matters: The social hierarchies created by decades of public "like" counts, and the noise level generated by clickbait posts and engagement lures, have worn on Gen Z. And constant pivots by social media giants have eroded younger users' trust.

Amazon has agreed to acquire One Medical , the primary care chain, for $18 per share in an all-cash transaction. It values the latter at about $3.9 billion, including its net debt.

Why it matters: This is Amazon's latest move into health care after some efforts panned out better than others.

Amazon is beginning wide-scale deliveries Thursday with its Rivian-designed electric cargo van , a next-generation logistics vehicle years in the making.

Why it matters: Significantly electrifying Amazon's delivery van fleet could help the company meet its ambitious target of hitting net zero carbon emissions by 2040.

Meta, the parent company to Facebook, Instagram and Whatsapp, reported its first ever year-over-year quarterly revenue decline since going public in 2012.

Why it matters: The results raise the question whether Meta's strongest growth period is behind it. Earlier this year, the Facebook app lost roughly 1 million daily active users — its first ever year-over-year user drop.