Just wanna share some article i read this morning..(:
1) What causes goose bumps.??
What Goose bumps are small bumps in the skin,which are caused by tightening muscles that pull body hair into erect position.Goose bumps may involuntary develop whan a person is cold or experiences strong emotions such as fear or awe.
Why Goose bumps keep the body warm by trapping an insulating layer of air between the hairs and having your hair stands on ends was intimidating to enemis.But some say that goose bumps are a good survival instinct even in modern times-a means for our subconscious to warn us of dangers.
Cause Goose bumps are caused by a reflex called horripilation or piloerection.All mammals including us have skin covered with hair.When the hair in the follicles lift up(piloerection) it makes the hair follicle stand out.And that causes goose bumps,so named because they look like the skin of a plucked goose(:
2) Why do onion make you CryT.T
When you cut into an onion, you rupture its cells, releasing enzymes that produce a gas called propanethial sulfoxide. Once that gas reaches your eyes, it reacts with tears to produce a mild sulfuric acid. And that hurts. The brain then signals the eyes' tear glands to produce more liquid to flush the stuff out. The more you chop, the more irritating gas you produce and the more tears you shed. "The onion's chemical reaction is a defense mechanism that evolved to repel pests," explains University of Wisconsin—Madison horticultural professor Irwin Goldman, PhD.
Prevention:)
Keep the stinging and crying to a minimum by chilling an onion in the freezer before cutting it; cold temperatures slow release of the enzymes. The highest concentration of enzymes is at the bottom of the onion, so cut it last to postpone the weeping (and the irritation) for as long as possible.
3) What causes"pins and needles"..(numbness/ ants)haha;p
Called paresthesia, pins and needles are caused by blocked blood flow to a pressed nerve. If you sit too long in an awkward position--or even just with your legs crossed--you may press hard enough on a nerve to interrupt its signaling to the brain, causing your feet, for example, to "fall asleep," or go numb. This is not the same as a pinched nerve, a longer-lasting condition that occurs when a part of the body, swollen because of injury or misalignment, applies steady pressure on a nerve. Paresthesia is usually felt in the extremities--hands, feet, and ankles. That crazy-making prickly sensation is the resumption of pain messages to the brain.
Prevention:)
Simply changing your position is almost always enough to allow the nerve to resume communication. But prickly feelings more rarely can be symptoms of diseases as diverse and serious as diabetes, lupus, and MS. If your pins and needles don't resolve quickly with a change of body position, see a doctor.
4) What make you laugh till cry?? (you are laughing or crying or vice versa)
Experts don't really know. One thing to consider: Laughing and crying are similar psychological reactions. "Both occur during states of high emotional arousal, involve lingering effects, and don't cleanly turn on and off," says Robert R. Provine, PhD, a psychologist at the University of Maryland, Baltimore County, and author of Laughter: A Scientific Investigation. We associate crying with sadness, but tearing up is an even more complex human response. Tears are triggered by a variety of emotions--"by pain, sadness, and in some cases even extreme mirth. It's just the way we've evolved," says Lee Duffner, MD, a professor of ophthalmology at the University of Miami's Bascom Palmer Eye Institute.
Advantages:)
As it turns out, that's good, because both laughter and crying can ease a stressful experience, probably by counteracting the effects of cortisol and adrenaline. So if you ever find yourself laughing until you cry, count yourself lucky. (: