Why do my eyes tear up when I look at the sky? The dots are actually white blood cells moving along the fine blood vessels (capillaries) in front of the retina at the back of the eye. This experience is called the ‘blue field entoptic phenomenon’ because it’s especially noticeable when looking into bright blue…
Category: Blog
Why does China not allow Facebook?
Why does China not allow Facebook? China. In China, Facebook was blocked following the July 2009 Ürümqi riots because protesters from the East Turkestan Independence were using Facebook as part of their communications network to organize attacks across the city, and Facebook denied giving the information of the protestors. What happened between Google and Huawei?…
Can magnetar destroy Earth?
Can magnetar destroy Earth? The closest magnetar from Earth lies about 50,000 light-years away in the constellation Sagittarius. According to a new video released by the YouTube channel What If, magnetars are relatively harmless, but if one gets too close to Earth, it could destroy the entire planet and all life on it. How long…
What is the difference between a pressurized water reactor and boiling water reactor?
What is the difference between a pressurized water reactor and boiling water reactor? The main difference between a BWR and PWR is that in a BWR, the reactor core heats water, which turns to steam and then drives a steam turbine. In a PWR, the reactor core heats water, which does not boil. This hot…
Do car salesmen listen to your conversations?
Do car salesmen listen to your conversations? If you somehow manage to get stuck in the salesman’s office haggling over numbers, he may receive a call and leave to let you and your partner “talk it over.” This is an old trick that some dealers use to listen in on your conversation, letting them know…
What is the formula for washing powder?
What is the formula for washing powder? Answer: Chemical formula of washing powder is Na2CO3. What chemical is washing powder? Most premium powdered laundry detergents contain the oxygen-based bleach sodium percarbonate plus a chemical, usually tetraacetylethylenediamine (TAED), that activates the bleach at low temperatures. What is the chemical formula of a detergent? C17H35COONa or sodium…
What is fail safe brake?
What is fail safe brake? Fail-Safe brakes are spring applied and hydraulic released, meaning that the braking starts, when the oil pressure to the brake disappears. Fail-Safe brakes can be used for a range of different purposes, such as parking and emergency stopping in case of power failure. What does ABS system failure mean? When…
Can you ask the bank to give you quarter?
Can you ask the bank to give you quarter? If you are a customer of that bank (meaning you have something like a checking account or savings account) they should honor your request. In that case, you could also make a withdrawal specifically for quarters or simply tell the teller that you’re in need of…
Is a resting heart rate of 50 good or bad?
Is a resting heart rate of 50 good or bad? A normal heart rate is generally stated to be between 60-100 beats per minute at rest (sitting, relaxing, etc.). However, recent studies (here and here) have suggested that an ideal resting heart rate is between 50-70 beats per minute. Is it bad if your heart…
What does it mean to be average looking?
What does it mean to be average looking? It means that a person, a man or a woman, is neither especially attractive nor especially ugly. This person’s appearance is only average, like that of many other people. What is considered average beauty? In physical attractiveness studies, averageness describes the physical beauty that results from averaging…