Yesterday I Learned

1. Speakers can act as mics. Ref: Speaker as a Microphone - Why can a speaker work as a microphone? I forgot where I learned about it. Similar to how motors when spinned produce electricity, the diaphram of the speaker can also be vibrated to produce a varying signal that resembles the input sound. That makes sense. 2. Moden WI-FI routers use the property of wave to have constructive and destructive interference with each other to direct the radio signal toward the device. Source: Steel Absorbs Gas Like a Sponge Instead of pointing the router/antenna toward the device, it changes the phase of an array of signal/wave being transmitted to constructively interfere toward the zone of the device, and destructively interfere on other regions. I ahd almost forgotten that there are more than one ways to imporve things... 3. There exists cells extracted from a human that hasn't died since 1951. Source: Michael Discovered A New Way To Make Twins There is an immortalized cell line used in…