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How To: Wire a 555 timer chip for PWM

This demonstrates how to wire a 555 timer chip for Pulse Width Modulation. Items used: solderless breadboard, 555 chip, 510 ohm resistor, 100k ohm variable resistor, 1 RGB LED at 20-25ma, wires, and 9v battery. And those vertical lines are what i mean in terms of what you can see only on the camera. You can see the led light of course without the camera.

How To: Spot problems in an African Spur-thighed tortoise

How do you examine a tortoise to determine its level of health? Does the tortoise need real sunlight or is a UV lamp alone adequate? Is dog food okay as a diet item? What about mites? How can you determine the sex of the tortoise? All this and more is answered by Herpetologist Hillary Dupont, with the help of Host Israel Dupont.

Apple AR: Put 3D Emojis & Text in Your Videos with Holocam

People love emojis, it's a scientific fact. So an app that places poops, smileys, and ghosts into social media videos should, in theory, be the most popular app ever. That's likely the reasoning behind the new Holocam app, which is available for $0.99 in the iOS App Store. Sure, Snapchat and Instagram offer users editing tools to stick static text, emojis, and drawings on top of photos and videos. However, Holocam ups the ante by placing fully three-dimensional emoji, text, and drawings, as w...