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Gas-powered leaf blowers can register as high as 100 decibels at the source (the levels decrease with distance). Most electric models range from 59 to 70 decibels.
The leaf blower originated in 1947 as a backpack fogger apparatus, invented by Japanese-based Kyoritsu Noki Company. Kyoritsu followed that design with a backpack/blower/misting machine in 1955. in 1968, Kyoritsu applied for a patent on a backpack blower mister design, and in 1972 established themselves in the United States as Kioritz ...
There are two types of upright vacuums; dirty-air/direct fan (found mostly on commercial vacuums), or clean-air/fan-bypass (found on most of today's domestic vacuums). The older of the two designs, direct-fan cleaners have a large impeller (fan) mounted close to the suction opening, through which the dirt passes directly, before being blown ...
Vergence-accommodation conflict (VAC), also known as accommodation-vergence conflict, is a visual phenomenon that occurs when the brain receives mismatching cues between vergence and accommodation of the eye.
Rose aphid (Macrosiphum rosae) feeding on buds and shoots Rose rust (Phragmidium) Two-spotted mite (Tetranychus urticae) on Gardenia Yellow tea thrips (Scirtothrips dorsalis) Bristly roseslug (Cladius difformis) on the underside of a leaf Cottony cushion scale (Icerya purchasi) Leaf damage caused by a leafcutting bee (Megachile sp.) Root-knot nematode (Meloidogyne sp.) nodule damage to roots ...