The critical mass density of the universe today is 
.Using the current observed value of 
,what is the average density of protons in the universe? If they were spread evenly throughout the universe,what would be their typical separation? Note that the mass of the proton is 
.
Definitions:
Sleep Reduction
The practice or phenomenon of decreasing the amount of sleep one gets, which can have various motivations and implications for health and performance.
Optimal Health
A state of complete physical, mental, and social well-being, not just the absence of disease or infirmity.
Security Alarms
Devices or systems designed to detect unauthorized entry or activities in buildings, homes, or other areas.
House Break-Ins
Criminal acts where an individual unlawfully enters a residence with the intent of committing an offense, typically theft.
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