« February 17, 2020 | Main | February 19, 2020 »

February 18, 2020

Jetman: The dream is alive

This video totally made my day.

When can I try it?

February 18, 2020 at 04:01 PM | Permalink | Comments (0)

The three main sources of household dust

1. Cleaning

2. Cooking

3. Movement

No wonder my house is so clean.

What with my rather sporadic housekeeping (Mario Buatta once remarked that dust protects furniture from sunlight wonderfully), heavy reliance on the microwave, and movement pretty much confined to my treadmill (which accumulates dust underneath remarkably fast and in huge quantities spiked with Gray Cat fur but is easily removed since it's bundled in one place), my house is just so spiffy.

I learned a lot about dust and its discontents in Michael Tortorello's New York Times story; excerpts follow.

Apparently, the amount of airborne dust doubled in the 20th century, according to a paper in the journal Atmospheric Chemistry and Physics.

The claim sounds outlandish.

The amount of dust in the world — like the amount of sin or acne — must be a constant.

The finding was somewhat surprising even to Natalie Mahowald, the lead researcher on the study and an associate professor of atmospheric sciences at Cornell University.

Although she was working with inchoate historical data, Dr. Mahowald said, "Nobody has come up to me and said, 'I don't believe you.'"

Climate change seems to be one source for all the new dust.

Human land use is another.

Anyone looking for a scapegoat — and that's all of us, isn't it? — can start with the droughts and desertification in North Africa, she said.

Dr. Mahowald said, "Dust is such a vague term. I'm being very particular here: soil particles suspended in the atmosphere."

Cleaning can have an unintended consequence: Oddly enough, it actually breeds dust.

In fact, cleaning is one of the three main sources of household dust, according to research on indoor particles.

Cooking is the second; movement is the third.

Every step disturbs tiny particles of dirt, fiber, soot, pollen, paint, food, and dead skin.

In common parlance, it's all dust, said Richard Flagan, the chairman of the chemical engineering department at the California Institute of Technology.

As soon as these motes lift off a carpet (or a TV remote or a ukulele), "you induce air currents" that propel them around the room, he said.

Several thousand particles of this stuff will waft in any cubic centimeter of air, a space the size of a sugar cube.

We travel through life emitting what scientists call "a personal cloud" of dust.

The only alternative is death, which is actually worse — what with the whole "ashes to ashes, dust to dust" thing.

How does dust fall onto a bookshelf? Slowly. Very slowly.

A piece of dust that is 100 microns in diameter (the size of a dot of chalk powder) will fall about a foot a second, said Flagan.

A mote that is 1 micron in diameter, the size of a bacteria, will fall just 30 microns a second.

And many of the particles created by cooking, which is a leading source of indoor dust, measure less than half a micron across.

Where does dust this small go? Anywhere it wants.

Trying to herd it into a dustpan is either an act of hubris or a clown routine.

Might as well try to snare a moth with a hula hoop.

Given these absurdities of scale, cleaning will inevitably scatter dust around the room.

Still, the forces of chemistry and physics can help.

There may be no more primitive dusting tool than a damp cloth.

You will not see it advertised on late-night TV.

But that doesn’t mean it won't work. "The reason that you use a wet cloth rather than a dry cloth," Dr. Flagan said, "is the liquid introduces capillary forces."

The dust will bond to the wet surface, he said. "And then the particle doesn't want to pull off."

The concept behind a vacuum cleaner isn't hard to understand.

The nozzle sucks air into a filter medium or a bag.

"Some of the dust strikes the filters and sticks, and some strikes other particles and sticks."

Then there is the considerable amount of dust that doesn't stick to anything.

A spinning brush may send small particles in a kind of appliance thrill ride.

And while the vacuum nozzle inhales, the vents exhale.

A HEPA filter, with its fine fabric grates, should capture petite-yet-nasty particles — the ones that wear size 0, so to speak.

As for those newfangled bagless vacuums with their racy cyclonic action?

Dr. Flagan contends that a centrifugal windstorm won't capture smaller particles, except by dumb luck.

That said, on the filth mats that we call carpets, "a lot of the stuff is big aggregates," he said. For that, "they’re pretty good."

Re: "... the filth mats we call carpets": this is precisely why I rolled up all my rugs and carried them down to the basement about five years ago.

My house feels way cleaner and easier to keep that way now.

The five-second rule no longer applies on these premises.

But I digress.

For those who can't get enough of dust, consider this entertaining book:

9780520231955-1

February 18, 2020 at 02:01 PM | Permalink | Comments (0)

Breakfast Is Served

crunch crunch

February 18, 2020 at 12:01 PM | Permalink | Comments (0)

"My First Boat"

My-first-boat1

Bob Mankoff named this one of his all-time 11 favorite New Yorker cartoons, wryly noting, "You can't go wrong with stupidity. When in doubt, make fun of an idiot." He relented: "But this is done in a lovely way. The guy who's doing this stuff is dumb, but the cartoon is clever."

Jack Ziegler's cartoon appeared in the July 11, 1988 issue.

[via TED Blog]

February 18, 2020 at 10:01 AM | Permalink | Comments (0)

Magnetic Pickup/Lifting Tool

4_26_87

It can lift up to 100 pounds.

Can your magnet do that?

nuf sed

From the website:

This is a powerful, high-quality hand-held lifting magnet that provides up to 100 pounds of lifting capacity.

2_31_21

The tool won't mar or scratch the surfaces of the items you're trying to pick up.

A multitude of uses: Perfect for metal fabrication shop or warehouse.

3_26_109

Well-designed easy-grip ergonomic handle makes it comfortable to use.

An easy way to move heavy objects that would be difficult or even impossible to move otherwise.

1_30_21

$6.99 (nuts pictured not included).

February 18, 2020 at 08:01 AM | Permalink | Comments (1)

« February 17, 2020 | Main | February 19, 2020 »