Is selenium essential for humans?

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Physics

Can sunlight provide power?»
               As we use up natural resources such ...
How do jet engines work?»
            Like rockets, jet ...
How does an aeroplane fly? »
               As an aeroplane moves though the ...
What is Greenwich Mean Time? »
               In 1884 an international ...
How do we measure time accurately?»
               After the invention of sundials, ...

Chemistry

How do we describe the elements livermorium, tennessine and oganesson? »
                        ...
What qualities make nihonium, flerovium and moscovium special? »
                    Nihonium is ...
What are the element numbers 110, 111 and 112? »
                      ...
What are the features of bohrium, hassium and meitnerium? »
                      ...
What are the characteristics of the elements 104, 105 and 106? »
                      ...

Biology

What is migration?»
            Migration is a ...
Can all birds fly?»
            No, not all birds fly. ...
Which birds fly the fastest?»
            The fastest known bird ...
Which is the largest flying bird in the world?»
            The Andean condor, with ...
How do feathers get their colours?»
               Colours in the feather of a bird are ...