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    ‘Lead’ pencils have never actually contained any traces of lead, but rather a mix of graphite and other materials.

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The second mission inside Biosphere 2 began

On the 6th March, 1994, the second mission inside the Biosphere 2 began when seven people entered the experimental artificial environment.

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  • On 15th February, 1972, The Soft Shell Mushroom Shaped Heart was patented... Read more »
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  • On 4th November, 1846, An artifical leg was patented... Read more »
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