Living in a cave

You —

The world before smartphones, digital TV and constant access to the internet was quite different.

People did not spend all their time in their bedrooms.

It was also more convenient to talk to people living in the same house as you than random people on the other side of the world.

And you sat in rooms and talked.

I prefer the new way.

Orange ball shaped fruits.

Hummus —

There's a few orange ball shaped fruits. Some seem perfectly round and others seem like they've been squashed and flattened. Some you cut with a knife, and with others, you peel the peel and eat the small segments. 

There's oranges, and tangerines, and then you have satsumas and clementines. (Theres probably more that exist but i haven't heard of them). I've always wanted to know what the difference is between them and what makes each one special. Why is a tangerine a tangerine and not a satsuma or clementine?