I would never survive back in the caveman days. My body is just too fragile & weak, but i use unscented soap since I get a rash with all the other brands. I have to use sensodyne toothpaste because I get sore teeth & gums. My biggest weakness is genuinely air quality though, especially when it is dry. Moisture in the air quality makes me sweaty & after that every one of us cut out, however no section is safe on our body from pimples, but the dry indoor air conditions are worse. My body just can’t function if it gets dry. My legs, arms & chest get dry to the point where I flake skin. My lips crack & bleed & chapstick doesn’t maintenance it. The nose is the worst though. I get bloody noses all Winter season long. The inside of it is basically a single big sore spot that bleeds when I touch it. To help argument these symptoms I use a humidifier with our furnace; A oil furnace device naturally dries out the air quality in a home. A humidifier than introduces moisture back into the house. Not only are our troubles less severe, however the oil furnace works better. A house just feels warmer when there is more moisture. I can set the temperature control a bit lower & then save some currency. Can you imagine me living in the wild? I would be a mess. The dry outdoor air would kill me. My skin would be a single dry, rashy mess after a week. I always assume that the survival of the fittest phrase does not apply to me. I am the extra person society has saved.