Jawed Karim's idea for YouTube was born out of a need for a better way to share videos online. He recognised a gap in the market and, rather than just complaining about it, he took action.

Per Jawed, firstly, one should use lukewarm water to wet their locks – the water should be neither too hot nor too cold. Once it is wet, then, apply oil to your hair.

YouTube co-founder Jawed Karim posted the 18-second video, titled “Me at the zoo.” It has since garnered over 90 million views. To this day, it is the only video on Karim’s channel.

Placoderms are extinct jawed fishes that lived from approximately 430 million years ago to the end of the Devonian 360 million years ago. Their heads and shoulder girdles are covered in bony ...