04:08
The Search for Intelligence: Environmental and Genetic Influences on Intelligence
Intelligence represents an interaction between genes and environment. Genes for abilities may not be totally additive, a concept known as emergenesis. Hundreds of genes may contribute a small amount of variance to a particular trait like reading dis...
04:39
Diagnosis: Cancer: Early Detection of Breast Cancer a Key to Survival
Eighty percent of women who are stricken with breast cancer have no family history of the disease. One factor that contributes to their susceptibility is age. Breast cancer is rare in women under 20, but increases from age 20 to 50. Another factor a...