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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.
Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
![Erythroblastosis fetalis. (a) The condition occurs with an RH+ father and RH– mother. (b) First preg](https://biology-forums.com/gallery/47/medium_14755_16_10_12_12_29_18_9451500.jpeg)
![A Dorsal view of a scan of the hand phalange of a child from Denisova that yielded mtDNA that differ](https://biology-forums.com/gallery/47/medium_273287_22_02_15_10_29_18_20802442.jpeg)