Sunday, May 12, 2024
SECOND SUNDAY OF MAY
Saturday, May 11, 2024
SAVOR THE COFFEE
Friday, May 10, 2024
BE CAREFUL WHILE HAVING COLD
Thursday, May 9, 2024
DO YOU KNOW
Why newspapers turn yellow over time?
Lignin makes wood stiff and trees stand upright. You can say it acts as a glue to bind the cellulose fibres together. Dr. Hou-Min Chang, a professor of wood and paper science at N.C., compares lignin to the concrete used in buildings, with cellulose as the steel frame. Without lignin, Chang says, a tree could only grow to be about 6 feet tall. Lignin also helps protect the wood from pests and other damage.
Newsprint, which must be produced as economically as possible, has more lignin in it than finer papers. At the mill, the wood that will be turned into newsprint is ground up, lignin and all.
Paper manufacturers utilise the benefits of lignin in some types of paper, though. Brown kraft paper, the dark brown paper used in grocery store bags, and cardboard are stiff and sturdy because they have more lignin in them, and because those kinds of paper aren't treated with bleaching chemicals. It doesn’t matter how dark they are because the printing on them is limited.
To make a fine white paper, the mill puts the wood through a chemical solvent process, which separates and discards the lignin. Pure cellulose is white, and the paper made from it will be white and will resist yellowing.
Lignin eventually turns paper yellow because of oxidation. That is, the lignin molecules, when exposed to oxygen in the air, begin to change and become less stable. The lignin will absorb more light, giving off a darker colour. If newsprint were kept completely out of sunlight and air, it would remain white. After only a few hours of sunlight and oxygen, however, it will start to change colour.
Wednesday, May 8, 2024
AQUATIC ANIMAL
Sea Pig
Thriving on the deepest ocean floor, Sea Pig behaves much like slugs do on land. They scavenge the ocean floor for any organic material using their tube feet to move them along and using their tentacles to push food into their mouth. The Sea Pig is not an endangered species, but rare to see due to the depths of ocean in which they live. Though they appear to be some sort of slug/pig combination, Sea Pigs are scotoplanes or sea cucumbers belonging to the genus of the deep sea Holothurians.
Tuesday, May 7, 2024
GLOBAL CELEBRATION OF LAUGHTER
Monday, May 6, 2024
NATIONAL GAME OF ARGENTINA
An African folktale
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If AI is so clever, why can't it solve a CAPTCHA? CAPTCHAs (Completely Automated Public Turing test to tell Computers and Humans Apart) ...
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Nag Panchami In Indian mythology, the world is supported on the hood of a giant snake called Shesha. And the myths and legends come to the...