why do the faces of persones sitting around camp fire appear to shimmer?
115200
Hot air is less dense than cold air.\nThe air around the fire is very hot and bends light like a lens. \nAs the fire is not uniform, the air heats and cools with the flames. This causes light to bend in different degrees. Your eyes follow these changes the objects behind the fire seems to be shimmering.
268333
Apparently yes. Over the past 300 years, there have been more than 200 reports of persons burning to a crisp for no apparent reason. See link for details and examples.
1141761
Apparently, they don't combust spontaneously. They just, sort of, smolder to ashes. \n\nThey're usually unconscious people whose clothing catches fire from a nearby heat source and then the fats in their bodies smolder until there's not much left of them.
514018
Some people get wrinkles from being in the sun too much
1075768
It may be from the heat.Put some powder on them and wear some boxers.
365104
death is possible--I think your friend is playing with fire.
76119
Have you ever looked down the street on a hot day and see that the street and air look blurry?  The same thing is happening.  \nWhen air is heated and cooled, its angle of defraction is changed.  When the angle is changed from the city lights, sometimes the light will be angled so that it misses your eyeball.\nWhen the road is hot, the angle of defraction is changed and gives the wavy appearance.
404922
It may be over-heating
364306
I have heard they are caused by dust on the lens or water.  However, my daughter can't seem to have a pic taken of her without either orbs or long thin white smokey ribbons all around her.  Even though she is only 22, I call her an old soul.  She is a sensitive, meaning she can sense and feel things others can't.  I am the same way.  I believe these may be spirits around her.
732278
You're playing with fire.
1056572
People say they are spirits. Or energy of them. But you have to be careful cause sometimes they get mixed up with dust. There is a difference. take a picture of some dust and compared the two. Also sometimes it can be the lighting in the photograph.
811023
They are chapped and you caan stop the burnning by putting chapstick on or drinking lots of water...
203903
Glass has been around for a long time and it is possible that someone fashioned a "lens" and did tricks with it (and was burned at the stake?).  More likely, tricks were done with campfire light and shadows on cave walls to form rabbits, gulls (or dinosaurs?).  Still a great way to entertain children, right?
875879
Hi. The burners are cooled by the gas flowing through them. This is the 'normal' condition.
1116528
mirage. \nair in contact with the hot road is less dense. the light coming from above (denser/cooler air) gets reflected. As a result a 'mirror' is formed on the road n u c reflection of sky on the road. this looks like water.
931030
That should only happen with copper or copper salts.\nIt's the oxidation of the copper in the flame.\nAll elements burn differently, this is the basis of how a spectrometer works.
535130
Dark skinned (tanned) are MUCH hotter.