HDMI connections can include component video, s-video, and DVI. Learn about the different types of HDMI connections and HDMI connection methods.
With an Ethernet "splitter", you can simultaneously connect two computers (or other network devices) on one Ethernet cable. You can buy Ethernet splitters.
How to add a power button to your Raspberry Pi - howchoo
We built a 1000 watt wind turbine to help charge the battery bank that powers our offgrid home. It's a permanent magnet alternator, generating 3 phase ac, rectified.
100 Engineering Projects For Kids - The Homeschool Scientist