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How are pearls formed?

Pearls (lulu) are produced by oysters, mussels and clams in response to irritation. When a piece of grit (gravel or sand) gets between the oyster's shell and it's skin (mantle), natural pearls are formed. This happens when tissues surround the grit to produce mother-of-pearl layers. Pearls are artificially produced by inserting particles into clam. The largest pearl ever found was from Philippines in 1936. It weighted 6.86kg. It is now known as the Pearl of Lao-tze
 
Do you know the curious case of clownfish?

Don't you remember Nemo, famous animation character from Pixar Studios. But there is something mysterious about this cute looking fish that the movie didn't tell you. Do you know that clownfish can change it's gender? True, clownfish are all born males and when the only female member of group dies the dominant male changes his sex and become female. A school of clownfish has a strict social hierarchy. The leader of school is a dominant female clown fish who is much larger than the other members. Second position in the hierarchy goes to the largest and aggressive among the males. All other males are at the bottom of the hierarchial ladder. Only the dominant male mates with the female clownfish. If dominant female faces natural or unnatural death, then the dominant male will eats more and grows in size and gradually transforms into a female (clownfish are born with both ovarian and testicular tissues and hormones determine the sex). Then one of the remaining males will be chosen as her breeding partner and this cycle continues. So the movie was completely wrong from the perspective of science, isn't it?
 
What is Lucifer effect?

The Lucifer effect describes the point in time when an ordinary, normal person first crosses the boundary between good and evil to engage in an evil action. It represents a transformation of human character that is significant in its consequences.
According to Christian legend, Lucifer was once God's favorite angel until he challenged God's authority and was cast into Hell with all the other fallen angels.
 
Which animal has the strongest bite force?

Do you think that the largest animal in the world with a cavernous mouth has the most powerful bite force. Fortunately blue whales don't have teeth instead they have baleen plates to trap a shoal of krill (a tiny crustacean). Most powerful bite ever recorded from a living animal is from the salt water crocodile. They have a mind boggling crushing force of 16414N (Newton is the SI unit of force). Now who has the most powerful bite force among land animals? Lions? Tigers? Leopards? No it is hyena, the master scavenger, who even dares to snatch food from a pride of lions. Hyenas have the most powerful jaw bones which can deliver a crushing force of 4689N. Sure, he is not the one to mess up with.
 
Jinsi ya kusafisha maeneo mbalimbali ya nyumba



Mtu alisoma kichwa cha makala atadhani tu kuwa kusafisha nyumba mbona ni jambo linaloeleweka, lakini ukikaa chini ukafikiria unaweza kujiuliza ni wapi pa kuanzia? Na ni namna gani unasafisha eneo fulani la nyumba kwa mfano bafuni.
 
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