Right now, as you’re reading this, cars are driving by, perhaps a conversation is being held in another room, the air conditioner, and fridge is whirring, a passing cloud is dimming the ambient sunlight slightly (or VV), the amount of bacteria and their waste in your mouth is growing, your shirt is gently rubbing against your skin, and many other routine things are happening that your senses CAN pick up constantly but tune out because it’s literally background noise (and sights/smells/touches/tastes).Your brain focuses on new/strange information, or things it deems important at any particular point in time. Your house smells, you just don’t notice it.
Everybody else’s house is a different environment so your brain notices it more. Friend’s mom loves making apple pie? House smells sweet as the scent permeates the walls. Uncle varnished his banister? Scent lingers for months/years, etc…
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