The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Did you know?
Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
Did you know?
Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
Did you know?
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Did you know?
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
Examples of hydrogen bonds
Umberto Boccioni, Unique Forms of Continuity in Space.
Periodic Table of the Elements
Three active forms of vitamin A: all-trans-retinol, -retinal, and –retinoic acid
A Haddon Matrix Identifying Preventive Elements for Motor Vehicle Collisions