Why Do Onions Make us Cry When We Cut them ? : In a Nutshell : Breaking open onion cells which releases enzymes which in turn react with other released substances to release a volatile gas – which when it reaches our eyes, it reacts with the water that is intended to keep our eyes moist.
While many search for the elusive Fountain of Youth, you might be wondering, Why do we age in the first place? What is it about our bodies or cells, biologically, that causes us to grow old?
You’re human brain is nothing short of amazing! Made up of billions of neurons that communicate in trillions of connections it’s one of the most complex and fascinating organs in your body.
In this article we look at some of the amazing and awesome aspects of the brain – effectively asking some deep questions – Who Am I, What is Reality, How do I Decide?
No, you’re not imagining it – your toenails really do grow much more slowly than your fingernails. In this article we look at some theories
More often than not, it comes from out of the blue. With only a second’s notice to brace yourself … achoo! Instinctively you close you’re eyes and the sneeze issues forth at speed. It’s such a forceful reaction one has to wonder : If you had managed to keep your eyes open – would they have popped out ?
If there’s one thing that has helped propel out species forward it must surely be the ability to speak. This relative revolution in evolutionary terms has allowed us to collaborate, co-ordinate, innovate, share ideas and express abstract concepts. But how did this come about ?
A fingernail is produced by living skin cells in the finger. Fingernails and toenails are almost exclusively a feature of humans and primates. But why do we have them at all ?
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 ?
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?
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 ?
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.
There are several ways we could measure what we are made of. We could classify ourselves as amounts of fat, bones, and muscle. Or maybe we could express ourselves by percentage of water (about 50-60% if you really want to know).