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A saturated fatty acid is when a carbon chain is completely surrounded by hydrogen

An unsaturated fatty acid contains at least one double bond between carbons. This creates a bend in the fatty acid structure

Unsaturated fats are liquid at room temp

The tails of phospholipids are hydrophobic, or water fearing

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Many archeologists and anthropologists disagree with dr. thorne's view.  thorne strongly believes that what many calls "homo erectus"  was in fact  homo sapiens,  and that they migrated out of africa almost 2 million years ago and dispersed throughout europe and asia. that's way different  from what scientists have always believed about the evolution of the species.