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/sci/ Science & Math

Threads added between 2015/11/25 and 2015/12/02

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Most viewed threads in this category

LiFi 100x Faster Than WiFi

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A German physicist at the University of Edinburgh, Harald Haas, has found a way to turn LEDs into wireless hotspots which have a verified speed of 1Gbps (224 Gbps in lab settings), 100x the speed of WiFi. A HD film could be downloaded in seconds. LiFi works by visible light communications. When you pass a current through an LED, the LED emits photons. Varying the current to the LED changes the photon intensity. LEDs are semiconductors, meaning the the photon intensity can be varied extremely quickly, and extremely delicately so that the changes in intensity are imperceptible to the human eye, but can still transmit information in the form of dimmer and brighter light. In this way the lightbulb acts as a wireless router. Haas says any LED will do. This technology would allow faster speeds, better security and reduced interference. LiFi has its problems: light cannot go through walls, so every room must have a lightbulb hub, and it cannot be used outside. http://www.ibtimes.com/what-li-fi-meet-revolutionary-wireless-technology-100-times-faster-wi-fi-2199883 I get how a lightbulb could transmit info to a PC via changing the light in the room, but I don't get how the laptop would send info back to the router unless you stick a lightbulb to it.
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If you were to start a space company, what would it be based on? I have a dream of sending spacecraft out to explore space. However, I need a way to fund that exploration. What are some profitable ideas? I was thinking something satellite based, maybe sending them out to space? Then eventually get into space mining once there is a widespread need for raw material in space. Or maybe get a piece of the sounding rocket business.

How to (Really) Engineer a Human Baby

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>The worry is that changing the DNA of the next generation is unsafe and a slippery slope toward eugenics. Yet many of the scientists attending the Washington meeting won’t be there to ban the technology, but to trade tips about how, exactly, they might be able to do it right. >One scientist who thinks he knows is Jinsong Li, a biologist at the Shanghai Institutes for Biological Sciences. Earlier this year, Li managed to use CRISPR to edit a gene that causes eye cataracts in mice, creating healthy newborn animals with “100 percent” success. >The way Li’s team did it was to avoid embryos, and instead edit “spermatogonial” stem cells growing in his lab. These are the factory cells that make sperm. By gene editing mouse sperm cells first, and then using corrected sperm to make embryos, Li’s mice came out perfect every time. Source: http://www.technologyreview.com/news/543541/how-to-really-engineer-a-human-baby/ So editing embryos is out, editing sperm cells is in. This is the future of human gene editing.
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How can something collapse in on itself and still produce an immense gravitational pull?
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Is nanoscience a part of chemistry, biology, or physics?

Math lecture fails

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ITT: We post what annoys us during math lectures. I'll give it a top-notch start: > professor struggling at the blackboard, because he thinks he can waltz through proofs
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Prove to me, using only science, that science is real. You cant.

programming projects

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Need some projects to flesh out my github. Already working through Project Euler. Would love something in the same vain. Any ideas Sci?
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how would i derive a formula for the sequence [math]a_{n}[/math]?

Handwriting Thread.

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It is ironic that the more maths a person does the neater the handwriting, with medfags having atrocious writings. ITT: Name your major + post PIC of your handwriting. Pure mathematics master race. PIC related.
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Theoretically speaking, If you throw a ball into a wall infinite times, there is a chance that the ball will phase through the wall because the atoms of the ball might avoid the atoms of the wall completely. So how would you increase this chance ?
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is he right /sci/? is the STEM job shortage a myth? Am i really fucked if I get a stem degree?

Maths porn

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Maths porn
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Where exactly does infinity exist? It can't be conceived in the real world. And you can't consciously experience it, so it must not be a spiritual entity like love or pain. So what special realm does infinity reside, according to the theory? And how can I access it like mathematicians do?
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I have a question for the M.Ds or Med students here. What are the likely consequences of second hand smoking on a adult person that has been exposed to it consistently throughout their whole life since about age 3??
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I have an assignment due in a few days in which I have complete this problem. I've tried but have no clue (yes I am retarded), could /sci/ possibly help a out a brother in need? or just point me to some relevant material? I couldn't even do part (a) I'm sure this is basic for you guys.
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What are the applications of QM really?
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How do you train your brains? I mean exercises and whatnot. Currently i'm playing this BrainWars apps but can't tell if increasing scores may have any influence on daily activities. Do you maybe know any better free apps for android?
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Please explain the Löwenheim–Skolem theorem to a retard. It's way over my head.
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when will lightsabers exist?






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