Learn how Everything Works!". Life Hacks Collection Part 1. Lifehacks Collection Part 2. Top 10 Rule-Breaking Projects, Upgrades, and Solutions That Are Better Than Off-the-Shelf Products. Top 10 Tech Concepts You Always Wanted To Learn About (But Never Did) Store your data on someone else's computer, hope they don't do anything bad with it or decide to shut down. Stallman calls it "Careless Computing". If you put personal data in-the-cloud like future plans., trips, your current GPS location, then you should expect that data to be shared all over the world with nice people, nice companies and criminals (looking for when to rob you).
Facebook connections and twitter followers provide information about you and your friends. If they assume you are similar to your friends, then the personal information those other people enter helps them build a profile of your likes/dislikes too. Photos tagged with your real name provide all sorts of other information that you may not want known to anyone in the world with a computer and internet connection. If you aren't paying for the services ( ea probably $15/month or more), then you and your data are probably the product being sold. It's good to have a paranoid person around, but citations please. Recycled Bottle Broom.
How to Make and Use a Pinhole Camera. You can load the camera either with film or fast photographic paper. Your choice of film or paper may depend in part on the exposure times. Paper, because it is less sensitive to light than film, will probably require an exposure of about 2 minutes for sunlit subjects. Film may require only 1 or 2 seconds for subjects in sunlight. Paper is easier to handle since you can load it into the camera under a safelight. If you use film, you can cut up a roll of KODAK TRI-X Pan Film or KODAK T-MAX 400 Profesional Film, 120 size, into 2 3/8-inch squares or 2 3/8 x 3 1/2-inch pieces. A camera made from a 2-pound coffee can will take a 2 1/4 x 3 1/4-inch piece of film or photographic paper. When you have the size of paper or film you need, tape it firmly to the inside of the end of your camera opposite the pinhole. It's a good idea to practice with an exposed piece of film or paper before trying the load the camera for your actual picture taking.