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Lee's Heating and Cooling Corporation

$49 for a Basic AC System Tune-Up from Lee's Heating and Cooling Corporation ($125 )

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Highlights

EPA-certified technicians perform routine maintenance and inspect your home’s AC to ensure it’s working properly and efficiently

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The Deal

  • $49 for a basic AC system tune-up ($125 value)

The Composition of Dust: Of Mites and Mars

When the cleaners are finished, you’ll be able to breathe easier. Increase your satisfaction with a look at one thing they’ve banished: dust.

Whether you’re resting in a mountain cabin, traveling through a city, or being vented out an airlock into outer space, dust is all around you. Microscopic particles—usually a combination of soil, pollen, skin cells, and minerals—can pile up quickly indoors. The problem is exacerbated by tiny creatures called dust mites, which gather in groups of up to 500 per gram of dust to devour flakes of human skin while multiplying in number, excreting waste, and probably chittering away. No matter where you are on Earth, a mote of dust is presently traveling straight toward your eye, thanks to the persistent creation of dust in almost any climate humans inhabit.

Even beyond our planet, dust is ubiquitous: astronomers face the universe’s untidiness every time they peer through a telescope and find formations of cosmic dust, which absorb the visible light around them. Although it comes from exploding stars rather than flaky humans, space dust isn’t so different from the domestic variety: a 2007 paper published in IEEE Transactions on Plasma Science explored the similarities between the formation of dust bunnies under beds and the coagulation of space dust into planets.

Need To Know

Promotional value expires 120 days after purchase. Amount paid never expires. Appointment required. Valid only within 25 miles of zip code 89106. Limit 1 per person, may buy 1 additional as gift(s). May be repurchased every 30 days. Merchant's standard cancellation policy applies (any fees not to exceed voucher price). Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

About Lee's Heating and Cooling Corporation