Humanity has become completely obsessed with the idea of cleanliness - antibacterial soaps and cleaners, hand sanitizers, antibiotics... The misguided hygiene hypothesis has done us a serious disservice to humanity, convincing us all that 'germs are bad'. It's reported that many millennials won't even touch raw meat. It seems we've become unnaturally afraid of the microscopic component of our reality. Is there legitimate concern here? Are we floating in a sea of evil microbes that are just...