Changes

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<div style="margin:0;background:#bae8bc;font-family:sans-serif;font-size:120%;font-weight:bold;border:1px solid #8AAA88;text-align:left;color:#000;padding-left:0.4em;padding-top:0.2em;padding-bottom:0.2em;">Did you know...</div>

<div style="margin:0;background:#bae8bc;font-family:sans-serif;font-size:120%;font-weight:bold;border:1px solid #8AAA88;text-align:left;color:#000;padding-left:0.4em;padding-top:0.2em;padding-bottom:0.2em;">Did you know...</div>

* ... that a narwhal's tusk is a tooth, that only some female narwhals have tusks, and that scientists do not know why narwhals have tusks?

* ... that a narwhal's tusk is one of its two teeth, that all male but only only some female narwhals have tusks, and that scientists do not know why narwhals have tusks?

* ... that, on occasion, mysterious sounds are recorded underwater, and no one knows where they come from? One famous one is The Bloop, which was much louder than even the loudest underwater animals (whales).

* ... that, on occasion, mysterious sounds are recorded underwater, and no one knows where they come from? One famous one is The Bloop, which was much louder than even the loudest underwater animals (whales).

* ... that, of the 17,000 words Shakespeare used, over 1700 are recorded for the first time in his works.

* ... that, of the 17,000 words Shakespeare used, over 1700 are recorded for the first time in his works.