Soaring through space at warp speed, travelling through time, and being indestructible are, unfortunately, all out of the reach of present-day science. The technologies we need to achieve wondrous feats such as these remain a mystery to us.
Luckily, science-fiction creators are not bound by the known and can use their imagination to fill in the gaps in current understanding, creating marvellous substances that can achieve the seemingly impossible. Here follows a summary of some of the most famous substances that only exist in our collective imagination.
(thanks Andrea)
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