The physics of why this 1967 engine stops an airplane better than anything Boeing builds today are wild.The JT8D is a low-bypass turbofan. Almost all the air goes through the core. When those bucket doors deploy, they're redirecting nearly the entire exhaust flow. Pilots estimated 8,000 to 10,000 pounds of reverse force from a 15,000-pound thrust engine. That's a 55-65% reversal efficiency on a machine from 1967.Modern 737s run the CFM56, a high-bypass engine where most of the air flows through

We’ve Tested Over 90 Air Purifiers—These 6 Are the Best You Can Buy

Division of Air Quality - Utah Department of Environmental Quality

Indian company using tiny air purifiers outdoors to "filter the air" of pollution.Here's how the scam works, the company bribed Indian government officials, who then uses public funds to purchase these machines, for each machine installed, those officials also get kickbacks.The claimed output of these machines is 300 m3/h, which is less than a commercially available indoor air purifier, which filters air up to 500 m3/h.This is why India is a joke country with a scam economy, it's governed by une