Neil deGrasse Tyson: At Google
Exactly one year ago, Neil deGrasse Tyson visited Google to talk about perfect alignments, worrying about grown-ups and the rise and fall of America’s favorite planet.
Neil deGrasse Tyson: UFOs and the argument from ignorance
Science has never been that entertaining.
And if you want to watch the full event: Cosmic Quandaries with Dr. Neil deGrasse Tyson.
Phil Plait: Why do black holes have such strong gravity
If you’ve been following Spoken Gems for a while, you might notice that I often post something unusual on Thursday. This time it’s Phil Plait, explaining what causes the strong gravity of black holes.
Found at Bad Astronomy.