"I always have to think about why things are important nowadays, when I first started out it wasn't like that."-Virgil L. ("Buck") Sharpton

Buck Sharpton has retired by now, and that's a shame. He was always a good speaker with subtle humor and blunt details. 

This LPI is about crater morphologies. You may notice that crater morphology gets talked about often. That's because there is a lot to infer out of it. So much so that what you can infer is still expanding. Many if not most modern planetary scientists were taught directly or indirectly by Buck.

• Slide at 21:20, the interiors of crater rims display the target rock as uplift. I to this day am still wondering why Curiosity never tried to see the outcrop of Gale craters uplift zone. Another important detail on this slide is that crater ejecta isn't expected to be a voluminous as it used to be. This is a recent change in thinking, but the material that was thought to be ejected is actually mostly injected.
• At 39:00 he transfers to talk about Venus, underscoring how little is known about it, even now.
• At 49:00 you get to learn a little trick of Radar that comes in handy in places like Titan and Venus. Radar is very sensitive to angles, and because of this you can math out a line to do trig with. So you can get accurate scales even without a sun-shadow or laser. With radar bright = rough and dark = smooth.
• At one hour Buck brings it home. A lot of solid Venus facts are in the latter half of this vid, but it is widely assumed that Venus lost it's whole surface at once. It's possible it didn't, but to make that work, Venus has to be thought of quite differently. 

You can see that Buck was a very good lecturer. Note how much more dynamic his presentation of Venus is. Did you even know about those parabolic "guppies" before? When you hear about Venus it's almost always some pre-school level content. Retrograde, hot, pressure. Stuff every kid knows. At the college level, they know more stuff, but it too is repeated so much the students start to just mention it offhand, not appreciating that the general public has no idea.