How Twins are Made | Identical, Fraternal, and Others??

Do you know how twins are made? I was surprised to learn how many people thought they knew but didn't. In this video, I clear up any confusion related to twinning (from a biological perspective). Watch this video and impress your friends with your twin knowledge.

Time stamps:
00:00 Intro
00:25 Normal Fertilization
01:06 Fraternal Twins
02:17 Identical Twins
03:22 Semi-identical Twins
04:01 Twins with different ages
05:07 Twins with different fathers