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May 21, 2022 9:00 AM
Steelmaking is a major source of emissions. These companies are racing to fix it.
May 20, 2022 6:00 PM
Featured in QR codes
Jan 28, 2022
These 3D-printed objects have scannable barcodes that you can’t see
The secret ingredient is infrared light.
Jan 17, 2022
Don’t get scammed by fake QR codes
Criminals can use the codes to try to steal money and personal information. Here's how to stay safe.
Oct 06, 2021
United fliers can soon use PayPal’s new QR codes to buy chips and booze in the sky
The company is partnering with United Airlines to roll out in-flight QR code payments, starting at Chicago O’Hare.
May 27, 2021
QR codes are a smart way to share data. Here’s how to make your own.
Never spell out your Wi-Fi password again.
May 25, 2021
QR codes are everywhere now. Here’s how to use them.
These intricate patterns hold URLs, apps, Wi-Fi passwords, and more.
