Does sugar have the same addictive properties of drugs? Well--only if you have what some doctors call "food addiction". These people have fewer dopamine receptors in the brain which is also a characteristic drug addicts have. However only a small percentage of people truly have this addiction.
How do dogs react when they see a peer wag their tail? Well--apparently it depends! Italian researchers found that when dogs see other canines wagging their tails to the left--the observer becomes anxious. But when dogs wag their tales to the right--the fellow canine becomes calm and even perceives it as a sign of companionship.