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face_with_colon_three Year 2018 This detailed information about axoxtl limb regeneration is giving scientists a better understanding of how this remarkable can regenerate and eventually it will help humans regenerate lost limbs too.

Limb regeneration requires a blastema with progenitor cells, immune cells, and an overlying wound epidermis, but molecular identities of these populations are unclear. Here, the authors use single-cell RNA-sequencing to identify transcriptionally distinct cell populations in adult axolotl limb blastemas.

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Many investors worry about the future of Berkshire Hathaway after its legendary CEO Warren Buffett is gone, but most of the conglomerate’s companies have already made the transition to reporting to the man who will eventually replace the 92-year-old.

Buffett himself and executives at Berkshire Hathaway companies like See’s Candy and Dairy Queen say they don’t have any qualms about Vice Chairman Greg Abel’s ability to lead the conglomerate. Abel already oversees all of Berkshire’s noninsurance businesses. So the main parts of the CEO job he’s not already doing are overseeing the insurance side of the company and deciding how to invest Berkshire’s nearly $131 billion in cash.

Buffett reassured investors at Saturday’s annual meeting that he believes Abel is the right man for the job and that he does know how to allocate capital following the same model Buffett uses even if he’s not making those spending decisions now. Plus, Abel did help oversee a number of large acquisitions at Berkshire’s utility unit that he led from 2008 until 2018, including the purchases of NV Energy in Nevada for $5.6 billion and Canadian power transmission firm Altalink for nearly $3 billion.

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Apple Inc.’s annual WWDC developers’ conference is fast approaching — and this one promises to be a bit more eventful than most, as the consumer-electronics giant is expected to debut its long-awaited mixed-reality headset.

The company hasn’t made a major product introduction since it rolled out the Apple Watch in 2015, but with an expensive headset supporting augmented and virtual reality, Apple AAPL,-0.88% will be entering into a market that has so far failed to catch on in a mainstream way. Meta Platforms Inc. META, +0.85% has bet big on virtual reality with its Oculus headset, with only limited traction.

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High-frequency light is useful. The higher the frequency of light, the shorter its wavelength—and the shorter the wavelength, the smaller the objects and details the light can be used to see.

So violet can show you smaller details than , for example, because it has a shorter . But to see really, really small things—down to the scale of billionths of a meter, thousands of times less than the width of a human hair—to see those things, you need extreme ultraviolet light (and a good microscope).

Extreme ultraviolet light, with wavelengths between 10 and 120 nanometers, has many applications in , studying biological objects, and deciphering the fine details of computer chips during their manufacture. However, producing small and affordable sources of this light has been very challenging.

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