Normally, a material absorbs and emits heat in a linked way: A surface that absorbs heat well at a certain wavelength and direction will also emit heat in the same way. This fundamental relationship, known as reciprocity, limits the ability to independently control heat absorption and heat emission.

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Robots on the factory floor. Self-driving vehicles on the Las Vegas strip. Even a substitute for man's best friend — the robotic dog.

It's getting more and more difficult to truly unplug. Expected response times by everyone from your boss to your family continue to trend downward thanks to ever-expanding cell coverage and ubiquitous Wi-Fi. It used to be that flying at 500 mph or so six miles above the Earth's surface was enough to shake it, but connectedness has caught up there too.

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L.O.L. Surprise! has a lot of, ahem, surprises in store for its 10th anniversary.

As part of the celebration, MGA Entertainment is set to debut a new live-action scripted series surrounding the product, which is touted as the “original unboxing brand.” For those who are unfamiliar with the dolls, they come equipped with blind bags featuring clothing, accessories and more that consumers are able to unwrap after purchase, showing the “surprises” within. Sometimes, the dolls themselves are even a surprise, depending on which product is purchased.

The new speakers are now available for $300 and $400.

Marshall

Marshall has launched its next-generation Acton and Stanmore vintage-inspired home speakers, four years after the previous models came out. The Acton IV and Stanmore IV cabinets are made from 100 percent wood and come with PU leather wrapping. While both speakers retain the model lines' analogue feel, Marshall equipped it with an upgraded media jog dial and power switch. The company also added M-buttons that users can customize to instantly activate Spotify Tap and play music or to quickly activate their preferred equalizer settings. 

Brothers Patrick and Ryan Coughlin, each with impressive careers in the tech industry (Patrick worked in national cyber defense, and at Splunk and Cisco; and Ryan with consumer products at Apple and Spotify), have launched a new kind of security startup. 

F eb. 25, 1968. The Conrad Hilton Hotel in Chicago, Room 1628. Jimi Hendrix’s pants are on the floor, and Cynthia Albritton is ready. Along with her friend and helper, Marilyn, she carefully measures equal parts dental alginate powder and 70-degree water. Their friend Dianne, the “plater” — the young woman designated with arousing the subject — is going down on Hendrix, trying to get him to the edge.

Rafael Nadal, 40, says constant self-doubt and competing against tennis's greatest players made him a better athlete.