Скорошни рецензии на SSCuttlefish

Let's say you've gone back in time
Nice one. Okay, we’re going to assume that you’re on Earth and you can read English. So far, so good.
First, we need some units. But no biggie. The exact speed of light in a vacuum is 299,792,458 meters per second. Good to know. A meter is defined in terms of light, but if you can’t measure it accurately, the length of a pendulum that takes one second to swing from end-to-end will do the trick. Pendulums tend to take the same amount of time to swing regardless of how high you start them off. So don’t worry about that. Pretty neat, right? Galileo discovered that. But whatever take the credit. If you don’t have a watch, a second is about how long it takes to say ‘one Mississippi’. And a gram is pretty much the weight of one centimeter cubed of water.
Flight: The wing took a long time to figure out. Just remember aerofoils are objects shaped such that air above them progresses faster than air moving beneath them. Slower moving air has more pressure. So there is a net upwards force. Attach an aerofoil of sufficient size to a machine capable of moving itself forward fast enough and it will fly. You can make a plane by attaching two aerofoils to a central body, add flaps at the trailing edge and you can control where it goes.
Technology: Heat milk to just below its boiling point: It won’t curdle and 99.999% of the bugs in it will be killed. Congratulations! You just invented Pasteurization. A moving electric field produces magnetism, and vice versa. Wrap copper wire around an iron core and run electricity through it and you’ve got an electromagnet. Don’t have any electricity? Put a magnet on a water wheel and put your copper-wrapped iron beside the wheel and hey presto, you’re converting mechanical energy into electricity. Don’t have any magnets? Heat iron to get a very weak one. Look for black grains in beach sands that stick together or examine the sites of lightning strikes for magnetic lodestones. Run electricity through tungsten to get the light bulb. Run electricity back and forth along a wire with enough power and you’ve invented radio. When a radio wave interacts with a receiving antenna, the exact same electrical charge can be recovered. Information can be encoded in two ways: In the charge of the electricity (higher current produces a higher amplitude) or in the frequency of the electrical reversals. FM is more resistant to amplitude decay in transit. Send out high frequency waves and measure how and when they bounce back and you’ve invented RADAR. Do the same with sound and oh man: SONAR. Mount a magnet so it can move freely, and you’ve invented the compass. Are you taking the credit? Polaris (The North Star) is just about the brightest star in the sky and it’s near the Big Dipper. Measure how high it appears to be, and the angle is your latitude. Quartz crystals are great: Run some current through them and they’ll change shape! Stop the current and they will resume their shape, and they’ll generate electricity with a very precise frequency as they do so: You can use this to build precision clocks. Nice. With these clocks, you can determine Longitude: Just set your clock to London time, take the difference between London Noon and local noon, and that’s how far away from the prime meridian you are. Hey! That’s longitude right there. That was easy. That deserves some credit. If you’re in 1714, the British have a 20,000 pound prize for a simple way to calculate longitude.

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