reactions – Tech Today w/ Ken May

We’ve been working towards nuclear fusion, a near-limitless source of clean energy, for the past six decades, and now scientists have made a major breakthrough. A new article published in Physical Review Letters details how to solve a dangerous issue with runaway electrons that has, until now, posed a major problem for fusion reactors. Fusion reactors model themselves on the reactions that power our stars: Hydrogen atoms collide at such incredibly high speeds that they fuse into helium. That process releases astounding amounts of energy. It’s the same thing that’s happening in our sun’s core right now. Runaway electrons are simply free-floating electrons that are energized by potent electric fields. In the high energy of nuclear fusion, the levels and speeds to which these runaway electrons are charged can be catastrophic. The team discovered that it’s possible to decelerate the electrons by injecting heavy ions, like neon or argon, into the reactor. The electrons collide with these neutral atoms, resulting in energy loss and slower speeds. It may seem like a small step, but every problem we solve with nuclear fusion moves us closer to finally achieving it here on Earth. Linnea Hesslow, coauthor of the article, told Wired , “Many believe it will work, but it’s easier to travel to Mars than it is to achieve fusion.” We’ve got a long way to go yet, but eventually (hopefully), we’ll get there. Via: Wired Source: Physical Review Letters

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Scientists may have solved a key barrier to fusion power

While the “Like” button on Facebook has traditionally been a quick and fun way to respond to a post, the truth is that it’s not always appropriate. “Liking” certain posts — say, the news of a pet’s death or a post about global warming — just feels wrong. Thankfully, starting today, that’s about to change. The social network has just announced a brand new feature called Reactions (which we’ve already heard about a few times ), which is essentially an extension of the Like button. Now, in addition to the thumbs-up Like we’re all familiar with, there’s Love, Haha, Wow, Sad and Angry. Love is signified by a heart symbol while the rest are animated emoji. To see them, simply press and hold on the Reactions button — it’s where the thumbs-up Like button is currently — select which one you want, and release. If the post has a slew of different reactions to it, you’ll see a summary of the three most frequent reaction icons. On the other end, the person receiving them will get notifications saying someone “reacted” to the post. Introducing Reactions from Facebook on Vimeo . “People come to Facebook and share all kinds of things, ” says Sammi Krug, the product manager behind Reactions. “And we kept hearing feedback from people that there wasn’t an easy way to express empathy for these different kinds of posts.” Zuckerberg in particular took the user feedback to heart and pulled a bunch of people together to start work on a solution about a year or so ago. From there, the team did a ton of research — from conducting surveys to analysis of the most popular stickers — to figure out just what reactions to add. When they whittled it down to about six, Facebook then began testing it — you can see we saw a sneak peek of Reactions as early as last October — in about seven different countries. “One of the things we really wanted to be careful of, is will this translate well” says Krug. “We wanted these reactions to be globally understood.” That’s one of the reasons Reactions is launching with just five additional icons instead of the original six that we saw in October. That’s because the “Yay” reaction just didn’t test well globally and was a little too vague in some markets. The rest, however, proved to be popular enough, with Love being the most popular out of all the new Reactions (The Like button, however, still reigned supreme). So does that mean we’re stuck with the six or so Reactions we have now? Not at all. “Once this actually rolls out, we’ll learn more about how people use the feature, ” says Krug. “We’ll continue to iterate it over time, based on user feedback.” Reactions will roll out globally starting today on iOS , Android , the desktop as well as the mobile browser. You’ll start to see the change occur over the next couple of days, though bear in mind that you do need to be on the latest version of the Facebook app to get the feature. Still, we had to ask, why isn’t there a “dislike” button? “It would have been too binary, ” says Krug. “This way, though, you’ll have more ways to express yourself. That’s the goal.” Source: Facebook

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Facebook officially expands beyond the Like with Reactions