• Question: if gravity pulles you down to earth, how do trees grow up?

    Asked by calvis to Mike, Pip, Tianfu, Tim, Tom on 28 Jun 2012.
    • Photo: Tom Lister

      Tom Lister answered on 28 Jun 2012:

      They push against gravity, a little bit at a time. For this reason, they grow from the top, rather than pushing up from underneath – that way it is a bit putting blocks on top of a tower, you only have to lift a little bit at a time.

      They also grow down (their roots).

    • Photo: Tim Stephens

      Tim Stephens answered on 28 Jun 2012:

      .

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