most (not all, some contributions are QTVR-only due to historical reasons)
many, but depends on photographer's choice of file upload (newer event = more likely to work) and your device's capabilities. You may experience slow playback, distorted images or unexpected browser quitting if there is only limited memory/GPU power available.
Most electric energy is not used where it is produced, so it has to travel from one place to another. Here are some electrical power lines, supported by a large pylon
(aka transmission tower). Nobody likes them in their backyard, but these lines are way too close to the apartment buildings: on quiet days, and all nights, you can actually hear the constant hum they produce, from inside the houses!