Since 1999, the EU and ESA have been trying to get a global navigation system off the ground to compete with the US GPS system. The European system, Galileo, came into operation in December 2016, but encountered major difficulties a month later. The satellites that record your position are equipped with extremely precise atomic clocks.
22 million tons of CO2 per year. That is the emission of computer systems that win bitcoins, according to a study by the technical university of Munich. That is about half the amount of CO2 that countries such as Norway and Ireland emit annually, and more CO2 than for example Estonia, Croatia or Kenya release into the atmosphere every year.
An induction stove works very differently from other heat sources. On such a stove, only the pan becomes very hot, while the hob itself only gets a little hot. The secret is an electric coil under the hob. Magnetism generates resistance When current flows through the coil, a high-frequency magnetic field is created.
If archaeologists find a hidden room in a prehistoric building, they are faced with the question: can we break the wall or will we destroy something crucial? This was also the case when a secret room was discovered with a mouse detector in the Pyramid of Cheops in Egypt. Muons are particles that arise when the atmosphere is hit by cosmic rays.
Propellers provide better lift NASA engineers are testing a new concept that can radically change the appearance of aircraft. The idea is to provide aircraft with a lot of small, electrically driven propellers, which blow extra air over the wings and thus improve the lift. The result is a device that can take off and land with much smaller wings.
The lie detector or polygraph was developed in the US in 1921 by a police officer and a medical student. The device measures the small, unconscious stress reactions that would indicate that you are lying. During the interrogation, the interrogator asks a suspect questions. He already knows the answer to some of them, such as the name and social status of the suspect, so that he can see how he responds when he speaks the truth.
Although we have just switched to daylight saving time, you have to reset the clock. All digital clocks in the Netherlands have been wrong since yesterday, because the clock has been set for not one hour, but two hours. As a result, the time is now one hour ahead. According to experts, this digital calculation error was caused by an attack by hackers.
If very heavy programs are running on a telephone or computer - or many apps at the same time - this requires a lot of the memory (RAM) of the electronics and the processor power. If you restart the device, the control is moved from the operating system (such as Windows or iOS) to the so-called bootloader - the only program that is physically built into the computer.
We call this instrument an infrared thermometer. You can find it in all sorts, all based on the same principle: measuring the infrared radiation that is emitted by everything. The purpose of the laser beam in some thermometers is to define the environment for which the temperature must be measured.
In the NIF (National Ignition Facility) lab in the US, a small hydrogen sample is under enormous pressure. The pressure in the test chamber is so great that the gas has passed into a liquid phase. But for the hydrogen drop, the real misery is only just beginning. Researchers turn on the world's largest laser and the bright light exposes the test chamber to enormous forces.
Recent studies show that we can easily be emotionally influenced by humanoid robots. With their head, torso, arms and legs, they are a bit like people, and if they look a bit like us, we will already treat them as human beings, especially if we feel that we have developed a bond with them.
The graphene material is 200 times stronger than steel. Now, new research shows that the extremely strong and light material still has a surprising property. If graphene is hit by gigahertz frequencies (red in the illustration above), it emits radiation in the terahertz region (blue, green and yellow).
The first instruments for cleaning the teeth date back to 3500 BC, when the Babylonians and Egyptians cleaned their teeth with a damp stick. Around 1600 BC the Chinese invented a chew stick of aromatic woods that cleansed the teeth and gave them a breath of fresh air. Halfway through the 16th century, the Chinese went one step further and attached the stiff hair of the pig's neck to a bamboo or bone stem.
A Faraday cage protects against electromagnetic radiation. You must have one at home: the microwave in the kitchen. The surface in the metal cabinet of the microwave is electrically conductive, which eliminates the electric fields inside the oven. Here you can see how a Faraday cage works: 1. Electric field hits the cage © Mette Airs & Shutterstock When you turn on the microwave, an electrically charged field (white waves) is created, which has negatively charged electrons (blue circles) and positively charged ions (brown circles) in the metal.
The men are impatient. In front of them is an engine of about 3 meters high, and according to the calculation it has a capacity of 5 hp. After having been busy for days with the adjustment, chief engineer Rudolf Diesel and his two assistants are ready to start the engine. The calendar of the German machine factory Augsburg indicates August 10, 1893.
With an automatic weapon, the high pressure that arises during firing is used to reload. But with a loose bag, the pressure is much lower. That is why a mouth stop is mounted on the barrel. This reduces the diameter of the barrel, so that the kickback is strengthened and the pressure in the barrel becomes high enough to guide the next bag and to reload the weapon.
You sit on the couch and talk to a good friend. It seems as if he is sitting next to you in person, while he is actually on the other side of the world. What you see is a razor-sharp hologram that is sent without delay via the 5G network to your augmented reality glasses, which project the image directly into your field of vision.
The nice thing about paper airplanes is that they are easy to make, that you can optimize them endlessly and that you can completely let go of your inner nerd to build airplanes that fly further and faster. If you are a rookie in the field of paper planes, you can start here.
Construction workers Bacteria bubbles repair concrete Roads, bridges, tunnels and dams are made of concrete, which over time erodes away due to weather, wind and water. If cracks occur, water and harmful substances can destroy the structure from the inside, so it is important to repair concrete in time.
Noise reduction is based on the acoustic phenomenon of destructive interference. If two identical sound waves are shifted in such a way that they come into opposite phase, the waves cancel each other out. The result is silence. 1. Microphone recording A microphone that sits on the headphones outside, captures background noise and turns it into a short audio clip.
The core of the global positioning system, GPS, is formed by 31 navigation satellites, located 20,200 km from the earth. Each satellite has a radio channel and an incredibly precise atomic clock, which displays the time accurately to three billionths of a second. The orbit of the satellites is fixed: there are constantly at least four above the horizon, wherever you are on Earth.