Why doesn’t it go dark when we blink? Because we have transparent eyelids. We see objects when light from objects enters our eyes and hits retina. Now, when we blink, our retina does not receive any light. Then, why does it not appear dark? Because our brain suppresses this information from retina. Ignoring the darkness. Thus, we do not consciously realize that it has gone dark. Also, experts say, a part of our brain called Medial Prefrontal Cortex. Stores last image we see before blinking and uses it to fill in darkness. Thus, we feel that we are watching a continuous picture. Without interruption. Also, if we blink while watching a moving object. Our brain gauges the difference in positions of the moving object. Before and after the blink. Accordingly, it adjusts our eye muscles. Helping them maintain focus on moving object, even after the blink. How do antacids work? They do not work. They are unemployed. You are unbelievable. When we eat food, our stomach secretes hydrochloric acid. This acid helps to digest food. However, sometimes when excess acid is produced. It rises from the stomach. And reaches the esophagus or throat causing acidity or heartburn. Now, in order to neutralize the acid, we take an antacid. Antacids work on a simple chemistry principle. Acid plus alkali produces salt and water. I am really weak in mathematics. Do not worry. I will explain it to you. Antacids contain alkalis like calcium carbonate or aluminum hydroxide. When we take an antacid. The alkali reacts with hydrochloric acid present in throat and stomach. Forming salt and water and thus, neutralizing the acid. In this way, antacids give us relief from heartburn or acidity. Why do we get eye bags? It is a sign indicating that we need to take a long holiday. No. One of the main reasons for eye bags is aging. As we age, various changes take place in our body. Yes, I get more attractive with age. Now listen. Our skin contains collagen and elastin. They keep our skin firm and elastic. In addition to this. We have fat tissue surrounding our eyes for cushioning. But as we age, our skin produces less collagen and elastin. Causing our skin to become loose. Also, muscles and ligaments that hold fat in place begin to get loose. And the fat starts dropping down. This loose skin and fat make area around our eyes appear swollen. Giving us eye bags. Besides this. Heredity, salt intake, smoking, may also contribute to formation of eye bags. How do painkillers work? They act like a sponge and absorb the pain. No. When something is causing us damage, such as tip of needle or pencil. Special cells called nociceptors send signals to the brain. The brain then perceives it as pain. However, when cells of our body are severely damaged or injured. They release chemicals like arachidonic acid. Now, just like a key fits in a lock. The arachidonic acid fits perfectly in enzymes called COX-1 and COX-2. Forming prostaglandin and other compounds. These compounds increase the sensitivity of nociceptors. Due to which it pains or hurts more. Now, the most common painkillers are aspirin and ibuprofen. These painkillers work by attaching themselves to COX-1 and COX-2. Thus, blocking them and not allowing arachidonic acid to bind to them. As a result, prostaglandin is not produced. And the sensitivity of nociceptors decreases. Hence, the pain begins to subside.