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Hey Fivers!

I know you've probably had your fair share of April Fools' day jokes today so I'll keep this edition 100% free of foolery. Promise. Maybe. 

By the way, how am I doing? Just reply to this address with any feedback you have. Do you like what you're reading? What would you change about Fives?
1. Control Your Computer with Doppler
This is probably one of the coolest projects I've seen someone put together in a long time. A web developer has taken advantage of your computer's speaker and microphone + the doppler effect to give you a new form of gesture control. With just a flick in the air you can scroll through a page, play an instrument, control a game, and more. The best part of this site is how the developer explains how the doppler effect works, walking you through each step of their algorithm (including the frequency shift in real-time!). You have to try this out. [Click]
2. Ultra-fast 3D Printing
For those of you who have used a 3D printer before, this may not seem that special at first. Trust me on this one, this printer is quite different. Carbon3Dr operates similarly to other SLS 3D printers (which shine light on a liquid resin to harden it and extrude out the shape), but can move much much faster. Anywhere from 25x - 100x faster, in fact. Considering the prints I print can take 3-12 hours, this is a huge step forward in "rapid-prototyping". [More]
3. Imaging through a Scattering Medium
This is a little more technical, but cool nonetheless. This Nature publication shows how full resolution images can be extracted when imaging through deep scattering medium. What mediums scatter light? Well, pretty much everything does, but this is especially important for microscopy and looking through biological tissue. This also helps us to form a deeper understanding of how light interacts with matter. [More] [Thanks Anshuman Das]
4. Fooling Computer Vision Algorithms
You know how Google, Youtube, and Facebook are designing image recognition algorithms for better search? They've basically built algorithms that can automatically identify and tag objects in a scene. Well, those algorithms work in a very specific way and can be fooled if you know how they work. Above, you can see a selection of images that is unrecognizable to us, but "easily recognized" by these computer vision algorithms. Pretty neat hack! [More]
5. Color-Changing Film
Researchers in California have found a way to create a film that changes color with physical deformation. This means that the structure of atoms actually changes enough due to this deformation to cause light to interact with it differently. For now, it's a neat trick that might be interesting for optics work. In the future, we may have color-changing materials that show stress and strain on an object or structure while it's actually happening. [More] [Thanks Achuta Kadambi]
Fives is written by Rohan Puri