Uzi maalum wa kupeana Likes: Comment chochote upate "Like"

Uzi maalum wa kupeana Likes: Comment chochote upate "Like"

574. What is a Mirage?

A mirage is a naturally occurring optical phenomenon in which light rays are bent to produce a displaced image of distant objects or the sky. The word comes to English via the French Mirage, from the Latin mirari, meaning "to look at, to wonder at". This is the same root as for "mirror" and "to admire".
You might think you are hallucinating when traveling on a hot afternoon, but mirages are a naturally-occurring optical illusion in contrast to visual hallucination. It can equally be captured on a camera.
 
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573. What rock floats on water?

Pumice varies in density according to the thickness of the solid material between the bubbles; many samples float in water. After the explosion of Krakatoa, rafts of pumice drifted through the Pacific Ocean for up to 20 years, with tree trunks floating among them.
 
Hutufundisha kuomba msaada na ushauri

Tunapofanya makosa, mara nyingi tunatambua kuwa tunahitaji watu wakutusaidia kuyarekebisha au kutupa ushauri. Kabla ya kufanya kosa ambalo limekuletea matatizo, unaweza kufikiri unajitosheleza au hauhitaji msaada wowote.
 
572. What is silent spring?

Silent spring was a highly controversial book published by Rachel Carson in 1962. It first addressed the problems caused by DDT or dichlorodiphenyltrichloroethane. It listed out it's environmental impacts which had lead to a major decrease in bird population, due to thinning of egg shells and the after effects. It also told that the insects were becoming resistant to DDT and it would have to be used in high concentrations with time. It created a huge controversy since nearly nobody believed her, but she was posthumously proved by more research. She had died of cancer in 1964, two years after the publication of the book.
 
571. What is bounced email?

Bounced email is an email that couldn’t be delivered. Specifically, it’s an explanation of delivery failure related to server or spam issues, whether they are permanent or temporary. Typically, it is a metric expressed as a percentage of subscribers who didn’t receive your message. There are two types of bounces: hard and soft.
 
569. What's the difference between hacking and cracking?

The difference is that a hacker is someone that uses their extensive knowledge of computer logic and code for malicious purposes, while a cracker - looks for back doors in programs, and exploits those back doors. Cracking is generally less harmful than hacking. Hackers are usually involved with web related hacking, like MySQL interception, or phishing, other forms of hacking would include things like brute force, or password lifting.
 
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