The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Did you know?
Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
Did you know?
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
Did you know?
Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
Did you know?
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Factors affecting vital signs of older adults
Chemical Reactions
Factors Affecting the Affinity of Hb for O2
Young children\'s understanding of an actor\'s intentions
Preschool children played with same-sex or opposite-sex playmates