May 2025

A new atomic clock in space could help us measure elevations on Earth

May 22, 2025
In 2003, engineers from Germany and Switzerland began building a bridge across the Rhine River simultaneously from both sides. Months into construction, they found that the two sides did not meet. The German side hovered 54 centimeters above the Swiss side. The misalignment occurred because the German engineers had measured elevation with a historic level…

Signal’s new Windows update prevents the system from capturing screenshots of chats

May 22, 2025
Signal said today that it is updating its Windows app to prevent the system from capturing screenshots, thereby protecting the content that is on display. The company said that this new “screen security” setting is enabled by default on Windows 11. Signal said that this new feature is designed to protect users’ privacy from Microsoft’s […]

OpenAI’s next big bet won’t be a wearable: report

May 22, 2025
OpenAI pushed generative AI into the public consciousness. Now, it could be developing a very different kind of AI device. According to a WSJ report, OpenAI CEO Sam Altman told employees Wednesday that the company’s next major product won’t be a wearable. Instead, it will be a compact, screenless device, fully aware of its user’s […]

Alt Carbon scores $12M seed to scale carbon removal in India

May 22, 2025
From a struggling family tea estate to an innovative climate venture, Alt Carbon has raised $12 million in a seed round as it plans to scale its carbon dioxide removal work in the South Asian nation. The climate-tech startup, which locks away carbon for thousands of years through enhanced rock weathering on farmlands, attracted investment […]

Luminar secures up to $200M following CEO departure and layoffs

May 22, 2025
Lidar company Luminar reached a deal with Yorkville Advisors Global and another unnamed investor that could bring another $200 million into its coffers through the sale of convertible preferred stock over an 18-month period. The agreement, which was announced in a regulatory filing Wednesday, follows an abrupt change in leadership and layoffs. Earlier this month, […]

Roundtables: A New Look at AI’s Energy Use

May 21, 2025
Big Tech’s appetite for energy is growing rapidly as adoption of AI accelerates. But just how much energy does even a single AI query use? And what does it mean for the climate? Hear from MIT Technology Review editor in chief Mat Honan, senior climate reporter Casey Crownhart, and AI reporter James O’Donnell as they explore AI’s…