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

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

Utafiti huo unabainisha kuwa mbali na viambata hivyo kuwamo katika vipodozi vya kupaka usoni, pia vinapatikana katika manukato, kemikali zinazotumika kubandika kucha bandia na rangi za kucha.
 
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88. How does aquatic animal survive under frozen lake ?

Underneath the frozen upper layer, the water remains in its liquid form and does not freeze. Also, oxygen is trapped beneath the layer of ice. As a result, fish and other aquatic animals find it possible to live comfortably in the frozen lakes and ponds.
 
89. What is bio ceramics ?

Bioceramics are ceramicmaterials specially developed for use as medical and dental implants. They are usually used to replace hard tissue in the body like bone and teeth. Common bioceramics are alumina, zirconia and a form of calcium phosphate known as hydroxyapatite.

Bioactive and Bioinert

Bioactive ceramics interact with the body so that tissue bonding and eventual incorporation into the body occurs after a time. Calcium phosphate-based bioceramics are bioactive.

Bioinert ceramics do not interact with the body's environment apart from causing an initial ‘fibrous tissue’ reaction, which coats the ceramic. Alumina and zirconia-based ceramics are classed as bioinert.
 
90. How does a ball point pen works ?

A ball point pen is a pen that uses a small rotating ball made of brass, steel, or tungsten carbide to disperse ink as you write. All of the pens that preceded the ballpoint -- whether quill, metal or fountain -- used a watery, dark india ink that fed through the penusing capillary action. The ink can flow unevenly.
 
Madhara ya kutumia vipodozi

Na Dk. Chris Peterson

Matumizi ya aina mbalimbali ya vipodozi yamekuwa na madhara mengi sana ya kiafya kutokana na malighafi zenye mchanganyiko wa aina mbalimbali za kemikali zinazotumika katika mchakato mzima wa utengenezwaji wa vipodozi.
 
91. How does detergent and soap work ?

Soaps and detergents are made from long molecules that contain a head and tail. These molecules are called surfactants. Water alone can't clean clothes because it won't attach to molecules of grease and dirt. Detergent is different. The surfactants it contains are made of molecules that have two different ends. One end is strongly attracted to water; the other is attracted to oily substances like grease.
 
92. Who created the first world map ?

The earliest Greek known to have made a map of the world was Anaximander. In 6th century BC, he drew a map of the then known world, assuming that the earth was cylindrical. The first Greek to draw a world map using the assumption of a spherical earth was Eratosthenes.
 
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