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).
Goose bumps are small bumps on a person’s skin at the base of body hairs. Tiny muscles at the base of each hair contract and pull the hair erect. The most common type of goose bumps is a response to cold.
Some people get grey (or white) hairs in their twenties, and others still have dark hair well into their seventies and eighties. The process of greying can occur gradually over many years as individual hair follicles stop producing colour, or it can happen within a matter of months or a few years. How long depends a lot on genetics.
In a Nutshell – Researchers say it is in the genes.
It’s the same reason some people are brown-eyed and some are blue-eyed. The Human Genome Project tends to support the theory that a single gene is responsible for handedness
There are many people who often claim to have an arthritic joint with the power to tell the future, at least meteorologically. The idea that certain painful health conditions are affected by the weather is an ancient claim, dating back to at least Hippocrates in the 4th century B.C and no even doubt earlier. But can this phenomenon be explained?
When an animal looks in a mirror, does it realise that it is looking at itself? – this is really a question of self-awareness. So if any animals, apart from ourselves, do actually know this we then have to ask – Which, if any, animals successfully make this connection?
How Can Flies Fly at Speed into a Pane of Glass and Seemingly Remain Uninjured ?
The answer lies in a basic physics equation – one we would all have learned at school – and in the fact that the anatomy of a fly is rather springy.
Grass stems and similar green leafy bits of plants make up the major part of the diet of many common animals, including cows, sheep, kangaroos and horses. If they can eat it, so why can’t we?
Did you know that your sense of smell and taste are connected? Also, as you get older, these senses can change ?
The problem with dinosaurs is that they lived a very long time ago- between 250 million and 65 million years ago – But is possible to tell what the lifespan of a Dinosaur might have been ?
From the fossil evidence, it’s clear that, species by species, individual by individual, dinosaurs were more massive than any other group of animals that has ever lived on land. It’s as if today’s laws of physics didn’t apply back then allowing them to grow to such a gigantic size. So what could possibly explain this ?