In cellular membranes, why do the tails end of the lipid molecules face towards each other?

The heads consist of Hydrophilic (water loving) and the tails consist of hydrophobic (water fearing) 

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Ithink most frequently occurring lab-acquired infection. proper way to clean up a small blood spill that has dried on surface are to be used when caring for all patients at all times. which of the following actions would violate a lab safety rule.