4 of the hottest videos on YouTube right now

Social Studies: I decided to surf over to YouTube to see what's trending. Check out this mixed bag of videos that include everything from Elf on a Shelf to riding a skateboard made of concrete.

Social Studies looks at what's trending on social media throughout the day so you don't have to.

I love YouTube. It has everything. Music, sports clips, movies, instructional videos, gaming videos and so much more. But I don't need to tell you; if you're reading this as an internet-connected person, you already know how universal YouTube is.

Anyway, I was checking out the latest trending videos on YouTube this morning and decided to gather a few that caught my eye because -- while the videos don't follow any specific theme -- they were interesting. Check them out!

First, tear down videos are always fun to watch. Since it's the holiday season, the folks from What's Inside decided to find out what, exactly, is inside the Elf on the Shelf toy. Toilet humor ensues (sort of kidding?).

Next, an illustrated video from Kurzgesagt -- In a Nutshell that talks about Neglected Tropical Diseases (NTDs). Even though the artwork and animation might be charming, the video is pretty horrifying initially. But the good news is, it has a happy ending.

Whether you're into skateboarding or not, this video from Braille Skateboarding is cool. The reason is it's not just about a skateboard, but maybe the heaviest skateboard ever: It's made out of pure concrete. Pretty cool, but performing a kick-flip is totally out of the question.

Finally, popular YouTube personality and co-founder of Beme, Casey Neistat, explains in five parts how he sold his company to CNN and what the future holds.