T6 - Finally, the American shrew mole is one of the tiniest mammals whose eyes are almost too small to even see!
The colossal squid has the largest animal eyes ever studied. It possibly has the largest eyes that have ever existed during the history of the animal kingdom. In a living colossal squid they measure about 27 cm across — about the size of a soccer ball.
Some species of dragonfly have more than 28,000 lenses per compound eye, a greater number than any other living creature.
Biologists say they have solved the riddle of how a tiny bacterium senses light and moves towards it: the entire organism acts like an eyeball.
Bacteria can talk to each other via molecules they themselves produce. The phenomenon is called quorum sensing, and is important when an infection propagates. Now, researchers are showing how bacteria control processes in human cells the same way. Bacteria can talk to each other via molecules they themselves produce.
So, bacteria can't reproduce sexually, but they can exchange genetic information with each other. Using a pilus, two bacteria make contact with each other and exchange genetic material. This is called conjugation. Some bacteria simply take up DNA which is floating around in their environment.
Humans have two eyes, but we only see one image. We use our eyes in synergy (together) to gather information about our surroundings. Binocular (or two-eyed) vision has several advantages, one of which is the ability to see the world in three dimensions.
Cyclopes (singular: Cyclops), one-eyed giants in Greek mythology, including Polyphemus. They had a single eye in the centre of their forehead. The Graeae, the three witches (or sisters) that shared one eye and one tooth between them; often depicted as clairvoyant.
Although chitons look very simple, these mollusks have a very sophisticated shell. Its outer layer contains up to 1000 tiny eyes, each a bit smaller than the period at the end of this sentence.
The mantis shrimp's visual system is unique in the animal kingdom. Mantis shrimps, scientifically known as stomatopods, have compound eyes, a bit like a bee or a fly, made up of 10,000 small photoreceptive units.
Spiders usually have eight eyes but few have good eyesight.
Some spiders have median eyes that can detect polarised light and they use this ability to navigate while hunting.
Only one animal cannot see in colour
The only animal that has been confirmed to see only in black and white is a fish called a Skate. This is because it has no cones in its eyes.
Microphthalmia is an eye condition that happens before birth. In this condition, one or both eyeballs are abnormally small.
An eyespot (sometimes ocellus) is an eye-like marking. They are found in butterflies, reptiles, cats, birds and fish.
Yes, natural purple eyes are possible. There are many different shades of blues and greys out there and many in-between colors. Although very rare, some people's natural pigmentation can even be violet or purple in color.
Every blue-eyed person today is a distant descendant of this one, ancient human. About 27% of Americans have blue eyes, making it the third rarest eye color.
Contrary to popular belief, true black eyes do not exist. Some people with a lot of melanin in their eyes might appear to have black eyes depending on the lighting conditions. However, this is not truly black, but a very dark brown.
The eye socket, or orbit, is the bony cup surrounding your eye. Seven different bones make up the socket. The eye socket contains your eyeball and all the muscles that move it. Also inside the socket are your tear glands, cranial nerves, blood vessels, ligaments, and other nerves.
According to this belief, humans had in far ancient times an actual third eye in the back of the head with a physical and spiritual function. Over time, as humans evolved, this eye atrophied and sunk into what today is known as the pineal gland.
You can see for miles and miles. On a clear day, you can see for up to 3 miles before the horizon due to the curvature of the earth. Yet you can see skyscrapers in a further distance than 3 miles due to no horizon obstruction. If you look into the sky you can see stars during the night that are millions of miles away.
Based on the sole criterion of production of reproductive cells, there are two and only two sexes: the female sex, capable of producing large gametes (ovules), and the male sex, which produces small gametes (spermatozoa).
13, 2007 — -- A new study from the University of Arizona says that women's offices have 3½ times more germs than men's. On "Good Morning America," Dr. Charles Gerba -- aka "the Germ Guru" -- shared tips on how to get rid of germs and stay healthy.
The human genome
Men and women have practically the same set of about 20,000 genes. The only physical difference in their genetic make up is in the sex chromosomes. Only males have a Y chromosome. Although the X chromosome is present in both sexes, there are two copies in females and only one in males.