The most amazing thing about these butterflies is that they return to the very same trees in Mexico that their great-great-grandparents used the winter before.

关于这些蝴蝶最令人惊奇的事情是，它们返回墨西哥的同一棵树，那是它们的高祖父母曾经在冬天栖居过的树。

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We shouldn't be surprised by the sophistication of these people's thinking: they were our great-great-grandparents after all, "he says."

我们不应该为那些史前人类的复杂思想而感到惊讶，他们毕竟是我们的曾曾祖父。

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But the one before that was visible only to your great-great-grandparents, on December 6, 1882.

CNN: A transit of Venus, an age of wondrous science

That's the story of parents, grandparents, great-grandparents, great-great-grandparents -- that determination, that perseverance, that sense of what is possible that has kept the American Dream alive and well in the Latino community.

WHITEHOUSE: President Obama at Forum on American Latino Heritage

Thanks to the efforts of a researcher at the Society of Genealogists, the body behind this weekend's Family History Show in London, I found out that my great-great-great-grandparents were married in an Aberdeenshire village in 1823.

BBC: NEWS | UK | Magazine | 'My ancestors got hitched in this church'