How to minimize this paragraph, so I can say it in 10 seconds = 20 words ?
Here's the paragraph, and honestly, I don't know how to sum it into 20 words, can you help?

"Researchers identified 19 types of smiles and put them into two categories: polite “social” smiles which engage fewer muscles, and sincere “felt” smiles that use more muscles on both sides of the face."

Question

How to minimize this paragraph, so I can say it in 10 seconds = 20 words ?
Here's the paragraph, and honestly, I don't know how to sum it into 20 words, can you help?

"Researchers identified 19 types of smiles and put them into two categories: polite “social” smiles which engage fewer muscles, and sincere “felt” smiles that use more muscles on both sides of the face."

Answer

Exactly 20 words:

Researchers categorized 19 types of smiles into sincere ones which uses all facial muscles and polite social - requiring fewer ones.

Answer

Here's my attempt

Research found 19 smiles which are grouped by 
"social" - that use less muscles
"felt" - that use left and right muscles.