If WiFi can track a heartbeat through walls, why can’t I get internet in my corner bathroom? Jason Cole was trying to figure that out too, but unlike me, he’s a PhD student in physics. So he mapped his own apartment and assigned refraction values to the walls (shown above), then applied so-called Hemholtz equations to model the electromagnetic waves. As detailed in his (math-drenched) blog, the best spot for his router was where you’d expect: directly in the center. Since that was out of the question, he was still able to get “tendrils” of internet by placing it in the corner of the apartment. His experiment implies that even in a distant room you could eke some connectivity by judiciously shifting around your laptop. Some commenters want him to turn his equations into a WiFi mapping web service — unfortunately, he thinks the idea is “unfeasible” due to the processing time and assumptions made.
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3D printers are pretty awesome, but none are quite amazing as this particular one that crafted a tiny spaceship that sits at 125 micrometers long, which is about the diameter of a human hair. The printer that made the spaceship was unveiled at the Photonics West Fair by Nanoscribe, which is a German company that specializes in nanophotonics and 3D laser lithography.
The spaceship is a replica of a Hellcat from the classic 90s video game Wing Commander. the ship took around 50 seconds to print and it measures 125 micrometers long x 81 micrometers wide x 26.8 micrometers tall. The printer used two-photon polymerization in order to craft the spaceship. This process uses short laser pulses, which activate photo-sensitive liquid polymer.
Of course, this thing can’t actually fly, but it goes to show just how tiny you can actually 3D-print things. Of course, the printer can print other things besides nifty spaceships. Other products that include tiny proportions are biological scaffolds and ultralight metamaterials.
The video above shows the entire 50-second process of building the spaceship from start to finish. You can see the laser pulses travel from the bottom to the top and witness the spaceship being built right before your eyes. While it doesn’t look like much at first glance, knowing that the object is the width of a human hair is simply incredible.
Source , Via