Metabolism is the process your body uses to convert food and drinks into energy to power all your daily activities. It also helps your body grow, repair itself, and get rid of waste.

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Muscle soreness after exercise, called DOMS (Delayed Onset Muscle Soreness), happens because tiny tears form in muscle fibers during intense activity, causing inflammation and pain that typically peaks 24-48 hours later. This is a normal response as your muscles repair and rebuild themselves stronger.

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We get colds more often in winter because cold viruses spread more easily when people stay indoors in close quarters, and cold air may weaken our immune system's ability to fight off infections. Additionally, winter viruses are naturally more active in colder temperatures.

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Déjà vu is the strange feeling that you have experienced something before when you actually haven't. Scientists believe it happens when your brain's memory system briefly malfunctions, confusing new experiences with old memories.

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Yawning is contagious because of mirror neurons in the brain that make us automatically copy actions we see others doing. When you see someone yawn, your brain triggers the same yawning response, even if you're not tired.

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