Did ancient cave artists share a global language?

The same 32 symbols show up in prehistoric European cave art.

Photo credit: PIERRE ANDRIEU / AFP / Getty Images
  • Many of these symbols are found in caves in Africa, Asia, Australia and America as well.
  • At least 40,000 years old, the set of symbols may have been a universal communications tool.
  • Among these symbols is the iconic hashtag.
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Why 'upgrading' humanity is a transhumanist myth

Upload your mind? Here's a reality check on the Singularity.

  • Though computer engineers claim to know what human consciousness is, many neuroscientists say that we're nowhere close to understanding what it is, or its source.
  • Scientists are currently trying to upload human minds to silicon chips, or re-create consciousness with algorithms, but this may be hubristic because we still know so little about what it means to be human.
  • Is transhumanism a journey forward or an escape from reality?
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Michio Kaku: Let’s not advertise our existence to aliens

The countdown continues! The 4th most popular video from 2018 involves humanity hiding behind a tree.

  • If advanced alien civilizations do exist, theoretical physicist Michio Kaku asks: Why would they want anything to do with us? It would be like an academic talking to a squirrel, he suggests, and he has a great point.
  • Hollywood and science fiction novels have conditioned us for years to believe that aliens either want to hang out on our intellectual level and learn from us... or destroy us. If alien life really does have the technology and know-how to make it all the way here, perhaps we should just play it cool and not assume that we are the top species in the universe.
  • Kaku speculates that our hypothetical demise would come at the hands of an intelligence civilization that sees us as no more than deer in the woods and wipes us out by accident — just as we have done to (what we deem) less remarkable species since time immemorial. Our best bet for survival? Lie low.
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The very best of 2018! 10 videos to get smarter, faster

From debunking flat-Earth theory to dissecting America's political woes, these are the must-watch videos of the year.

  • 365 days, 365 videos — it's been another huge year for big ideas.
  • We've tallied up the 10 most popular, as chosen by you, plus the most controversial and most talked about videos of 2018. Enjoy!
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Human extinction! Don't panic; think about it like a philosopher.

Most people think human extinction would be bad. These people aren't philosophers.

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  • A new opinion piece in The New York Times argues that humanity is so horrible to other forms of life that our extinction wouldn't be all that bad, morally speaking.
  • The author, Dr. Todd May, is a philosopher who is known for advising the writers of The Good Place.
  • The idea of human extinction is a big one, with lots of disagreement on its moral value.
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