Paul McEuen

Carbon nanotubes are amazing because they're really good electrical conductors, yet they are only a few atoms in diameter. You can make transistors out of them in the same way you can with silicon. At Berkeley, we made the narrowest device anybody had ever made. It was basically a single molecule.

American Physicist

Mary Roach

Chew on this: Human teeth can detect a grain of sand or grit 10 microns in diameter. A micron is 1/25,000 of an inch. If you shrank a Coke can until it was the diameter of a human hair, the letter O in the product name would be about 10 microns across.

American Author

Richard Preston

An Ebola particle is only around eighty nanometres wide and a thousand nanometres long. If it were the size of a piece of spaghetti, then a human hair would be about twelve feet in diameter and would resemble the trunk of a giant redwood tree.

American Writer

Joshua A. Norton

Now, therefore, the Directors of the company are hereby ordered to see that precautions are taken to make travel on said railroad perfectly safe by using a screw with at least twenty-four inches diameter.

American Celebrity

Lennart Nilsson

There is a new way with very very tiny fiber optics, which give an enormous high resolution. There are many many thousand fibers, very very close together with a very small diameter.

Swedish Photographer

William Henry Ashley

Many of their lodges remained as perfect as when occupied. They were made of poles two or three inches in diameter, set up in circular form, and covered with cedar bark.

American Businessman

Albert Claude

Small bodies, about half a micron in diameter, and later referred to under the name of 'mitochondria' were detected under the light microscope as early as 1894.

Belgian Scientist

Sarah Parcak

Satellite datasets like WorldView can see objects as small as 1.5 feet in diameter. In 2014, WorldView-3 will be able to see objects a small as a foot.

American Scientist

Samuel Johnson

You teach your daughters the diameters of the planets and wonder when you are done that they do not delight in your company.

English Writer

Mildred Dresselhaus

The holy grail would be to turn a knob, and out comes the nanotube of the right diameter and chirality.

Imagine cutting through an object's center; 'diameter' is that end-to-end line.

Visualize Measurement

'Diameter' can describe the width of various objects, not only perfect circles.

Not Just Circles

The diameter is always twice the length of the radius.

Two Times Radius

In math, 'diameter' is precise and used in formulas, not just for size descriptions.

Math Precision

For spheres and cylinders, the 'diameter' passes through the center of the volume.

3D Objects

In optics, 'diameter' helps assess lens strength — a shorter focal length means more power.

Optical Power

A larger 'diameter' suggests a wider lens, impacting light gathering and field of view.

Lens Size

In computing, 'diameter' indicates complexity; a smaller diameter means less complexity.

Graph Complexity

Network 'diameter' can show the efficiency of communication or routing within it.

Pathfinding Relevance

 and if you go deep enough, you cannot detect the tunnel. Sometimes people think, well, it's going to be pretty annoying to have a tunnel dug under my house. Like, if that tunnel is dug more than about three or four tunnel diameters beneath your house, you will not be able to detect it being dug at all.

Elon Musk: The future...

 But most kidney stones don't become this serious, or even require invasive treatment. Masses less than five millimeters in diameter will usually pass out of the body on their own. A doctor will often simply recommend drinking large amounts of water to help speed the process along,

What causes kidney...

 being a thousandth of a millimetre that's smaller than the diameter of a human hair now while plankton may appear to be aimless drifters directionless in their movements in life they play a key role and perhaps the most vital organism on earth you see each and every plankton

Why Are Plankton the...

 on earth we look at these hot springs on the seafloor giant tubeworms the iconic animals the blood red plumes really very beautiful in life they get eaten by other things these two worms are called it can be as big as me and it can be about you know an inch or so in diameter

Beyond the edge of the...

 the robot naturally becomes agile. So here, R is the characteristic length of the robot. It's actually half the diameter. And there are lots of physical parameters that change as you reduce R. The one that's most important is the inertia, or the resistance to motion.

Robots that fly ... and...

 when Tony said big balloons he meant big balloons at the size of those things our warp up and it's going to get bigger when this balloon is fully inflated it'll have a diameter of two and a half meters and it will hold over seven cubic

Lifting a Man with...

 using light or other mechanisms directly to things like these prosthetics. And if you can do that, then you can begin changing fundamental aspects of humanity. So how quickly you react to something depends on the diameter of a nerve.

What will humans look...

 like these stumps that were giving up for dead like I was given up for dead surprise surprise they came back to life so we went and found the biggest stump right here we found groves of redwoods that are 30 foot plus in diameter it's

One Man’s Mission to...

 and has a diameter about the distance between the earth and our sun. Because black holes are invisible, the only way for scientists to detect and study them is to observe their effect on nearby matter. This includes accretion disks,

Black Holes 101 PIPE...

 the world's first man-made satellite, into space. This little metal ball, smaller than two feet in diameter, launched a space race between the U.S. and U.S.S.R. that would last for eighteen years