How do peoples laughter affect others?

Is herbalife safe to take after a renal transplant? What is your iron level supposed to be in your body? Why do legs feel stiff and hurt after sitting then loosen up after walking? Is roan tattoo ink good? What is the best type of catheter to use? What instruments are used in love me do? How many barracks should you have in thirst of night? What is the average waist size of 5'10 men? Can you take omeprazole with metronidazole? Why do I feel like a monster? How does weed help you fall asleep? What are the three basic rules of good eye habits? Is spending too much time with wife and kids wrong? What do you need to buy for year 8? What are some reasons for having summer breaks? Are 500gm of milk equal to 500ml of water? Is tares a type of weed? Who flirts more men or women? Is abdominal fat considered a greater threat to your health than hip and thigh fat? Listen closely i am hard to understand i am as elusive as a handful of sand even if you perceive me you know me not before you can tell me what i have forgot what am i?