This title did not age well or was right on the mark depending how you look at it

57:44 "Gravity must be a quantum theory."—Bravo!

I've learned a lot about cows, suns, sweat and multiplying. Guess Im on my way to get my Nobel prize. Thanks :)

This is by far Lawrence's greatest and most engaging lecture, way better than the powerpoint presentations.

the best part about him is his humility

this is probably in the top 10 funniest physics lectures ive seen this week

I love Lawrence Krauss. He's like an overly enthusiastic puppy about science, walking up and down, shouting, waving his hands..."Isn't science awesome you guys!!!?"

Physics  = Order of Magnitude calculations   + Dimensional Analysis

This is nothing short of completely delightful. I love watching this man.

Just watched this video and loved it! Very engaging, witty, intellectual and amazing. Lawrence Krauss is amongst my favourite scientists of all time. In one word AWESOME

sometimes i come back to this video just to remind me. :)

This was outstanding.  His lectures are even more engaging than his PowerPoint speeches.

I love Lawrence Krauss, he really makes physics looks like a complete enjoyable experience.

I couldn't help myself imagining Pro. Krauss teaching high school physics. I didn't do physics when I was in high school because I was afraid of it so I did chemistry instead. But if I had Professor Krauss as my physics teacher, man! I would have become a theoretical physicist by now -*-  

Loved the lecture!
Even his erasing of the board was an approximation!

Bravo... you are the best Lawrence...

I love Krauss. Been watching all his lectures again! Thanks for posting this!

Great lecture, great speaker.  Worth a watch.

education + comedy = dope.

Well, from this lecture, I learned two things:
Everything can be expressed as a sphere, and math is suddenly easier than I thought :)