What were the hardships faced by Shackleton and his expedition to Antarctica?

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Physics

Forms of Energy»
How do we measure temperature?               ...
Where does the Earth’s energy come from? »
                 There is a basic law of ...
Forms of Energy»
What is light?                Light is a ...
Natural Properties»
  Why does my breath ‘steam’ in cold weather?       ...
Natural Properties»
What happens when a liquid boils?               ...

Chemistry

Natural Properties»
  What are acids?               ...
Natural Properties»
  Why does my breath ‘steam’ in cold weather?       ...
Natural Properties»
What happens when a liquid boils?               ...
What are plastics? »
                 Plastics are ...
Can metals float in water? »
                   Some very ...

Biology

What makes the snow leopard an endangered animal? »
               A snow leopard is a large cat that ...
Why is the sei whale an endangered animal? »
            The sei whale is one of the fastest whales in the ...
Why the Grevy’s zebra is considered an endangered animal?»
            The Grevy’s zebra is an important member of the ...
What makes the giant otter rare? »
               The giant otter is a carnivorous ...
Why the Rothschild’s giraffe is considered an endangered animal? »
            The Rothschild’s giraffe is a subspecies of ...