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E Ink has introduced its Kaleido 4 display panel, claiming improved color saturation, better visibility, and smoother page-turning performance compared to prior generations of its color e-paper technology. The upgrade targets devices like ePaper tablets and e-readers that currently rely on E Ink's screens.
E Ink has announced Kaleido 4, a new color e-paper display technology that doubles color gamut volume to over 40,000 colors and improves white reflectance and contrast. The company says an added oxide backplate lets the screen refresh fast enough to show video at 18 fps, addressing a longstanding weakness of e-paper displays. Kaleido 4 is currently used only in Hanvon Technology's M10 C II tablet.
E Ink has announced Kaleido 4, a successor to its widely used Kaleido 3 color e-paper technology found in most color e-readers. The company says it doubles color gamut volume, increases white reflectance by 15 percent, boosts contrast by 50 percent, and uses a new oxide TFT backplane enabling refresh rates up to 18fps. Hanvon Technology will be first to use the display, in its upcoming M10C II tablet, which will only be sold in China.
A developer has released c64-hw-sim, a program that models the Commodore 64's ASSY 250407 motherboard at the level of individual chip pins and the board's netlist. Users can simulate faults such as lifting a chip leg or shorting it to ground or power, then observe the resulting effect on screen output, keyboard behavior, and board signals. The simulator derives these outcomes from circuit behavior rather than pre-programmed fault scenarios, and runs at 31-48% of real C64 speed depending on the host processor.
The developer behind the iTerm2-Color-Schemes GitHub repository has launched TerminalThemes.com, a web application offering over 800 terminal themes with downloads in nearly 40 formats including iTerm, Ghostty and Windows. The site is free to browse and download without an account, while registered users can vote, bookmark and submit themes.
An Entrepreneur contributor argues that handing entire video edits over to AI often produces a repeating failure pattern: prompting a fix for one issue like pacing frequently disrupts something else, such as a transition or caption timing, that previously worked. The piece notes AI handles narrow, mechanical tasks well—motion graphics, cleanup, color correction—but struggles with holistic creative judgment.
Antima Jain and Pooja Choudhary, friends who met 11 years ago in Minnesota, used their own savings to launch a Color Me Mine paint-your-own pottery studio franchise in Edina in March 2025. The pair, both immigrants from India, bonded over shared interests before deciding to start a business together as their children grew more independent.
In July 1976, mathematicians Kenneth Appel and Wolfgang Haken, aided by programmer John Koch, proved the Four Color Theorem using roughly 1,200 hours of computer processing and 10 billion logical decisions. The achievement, the first major theorem proved with heavy reliance on a computer, drew sharp criticism from mathematicians who argued that a proof no human could fully verify by hand should not count as legitimate mathematics.
A. Boogert's 1692 manuscript Klaer Lightende Spiegel der Verfkonst, a 900-page guide to mixing watercolor paints, survives as a single handwritten copy containing over 700 pages of hand-painted color swatches. Medieval historian Erik Kwakkel located the volume in a French database, and a high-resolution scan of the entire book is now available online.
Two independent research teams have traced orange fur in cats to a small missing DNA segment near a gene called Arhgap36, located on the X chromosome. Stanford geneticist Greg Barsh and colleagues found this 5-kilobase deletion present in every orange cat examined among 188 cats studied, and found orange-producing skin cells expressed 13 times more Arhgap36 RNA than non-orange cells.
Amazon is selling the Arlo Pro 6 four-camera indoor/outdoor security kit for $180.49, a 25% discount from its regular price. The system includes 2K HDR video capture, color night vision, and wire-free installation for flexible placement.
Staples provides online tools for designing photo gifts like mugs, prints, and puzzles, with print quality comparable to competitors. Customers can also visit local stores to consult with print specialists, get proofs before printing, and pick up same-day orders. For higher-quality results, orders can be routed through Staples production centers, though this takes longer—up to two weeks.