The late Walter Koenig appeared on many more TV shows than just Star Trek. Here are his five best non-Trek performances, ranked.
Celestium on MSN
Alien life might run on a blueprint far weirder than DNA
This video starts with a simple question — does life really need DNA? — and then turns it into something much bigger. From RNA worlds and TNA protocells to exotic XNAs, methane-compatible chemistries, ...
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