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.
So editing embryos is out, editing sperm cells is in. This is the future of human gene editing.
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.
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.