Skin colour is the result from the presence of a pigment called melanin, located in the epidermis, or outer skin layer, and produced by cells called melanocytes. But why would there be such a variety in Human Skin Colour ?
“How Do Satelites Always Stay in the Same Place in the Sky?” – In fact not all satellites do – only the ones called geosynchronous.
A black hole is perhaps one of the strangest objects in our universe. It is in fact the remains of a massive dead star that has run out of fuel and collapsed. But how do we know it’s there ?
Hairy heads, hairy legs, and hairy armpits-the human body is covered in the stuff! Although many of us attempt to get rid of it, it is still obvious that men have more body hair than women. So what is the point of body hair, and why are men so hairy?
A black hole is perhaps one of the strangest objects in our universe. It is in fact the remains of a massive dead star that has run out of fuel and collapsed.
Given that astronomy is the oldest science and that sunrise and sunset are very basic celestial phenomena, you might have thought this would have been sorted out centuries ago. Not a bit of it!
Why Can’t We Invent a Time Machine? – Well, theoretically it IS possible to travel in time – but only forward, not backward in time.
When ants discover a food source its not long after that their fellow colony members descend on that location to make the most of any tasty morsel that’s been discovered. Clearly there’s some form of communication going on between colony members – but how ?
What Makes the Earth Rotate? … In a Nutshell : Earth rotates simply because it has not yet stopped moving!
Anything that is transparent allows light rays to get through the thicket of atoms packed within it more or less unscathed. The reason light can make it through substances like glass is that their molecules only mop up light of wavelengths shorter than those of visible light.
The human eye and brain work together to perceive colour. Light is sensed on the retina at the back of the eye. The centre of the retina contains about 6-7 million cells called cones. Different ones are sensitive to red, green, and blue light.
Our Universe is a remarkable place and not a little odd in some of the ways it works. For instance have you ever heard of left and right handed molecules ? Or been told that, chemically speaking, an orange is a ‘left-handed’ lemon!
Why Do We Cry? In a Nutshell : Crying is beneficial to health and mental well-being. A good cry is great for body and mind.
We also look in this article at the very complex plumbing system and tear film layers that work hard to protect your eyes.
While the planets may not affect us in ways astrologers would have us believe, events on Earth are undoubtedly influenced by the gravitational pull of our celestial neighbours and the results are rather more important than liaisons with tall dark strangers. But what exactly are the effects?