As we officially start a new year of trending videos in 2013, let's take a look back at the most-popular and top trending videos across a wide variety of interesting YouTube video categories that helped make 2012 the year that it was!

(Click through to view playlists)

Top 10 Trending Science Videos of 2012	Top Trending Sports Videos of 2012	Top 10 How-to and DIY Videos of 2012
Top 10 Eye-Popping Videos of 2012	Top 10 Cover Videos of 2012	Top 10 Awe-Inspiring Videos of 2012
Top Trending Beauty Videos of 2012	Top Trending Comedy Videos of 2012	Top 10 Pet Videos of 2012
Top 10 Political Videos of 2012	Top 10 Gaming Culture Videos of 2012	Top 10 Holiday Videos of 2012

And, in case you missed it, here's our recap of the top overall trending videos of the year.