1960s
A slide of the human chromosomes is shown. LSD experiments are…
More of the presenter talking about genetic traits shared between…
Presenter flips chart to reveal graphs on Intelligence Quotient…
Identical twin boys giving a classroom presentation on how twins are…
Presenter shows three sets of twins: a boy- girl pair, female fraternal…
Presenter uses charts to explain how twins develop. With identical…
1970s
This clip discusses the connection between malaria and the sickle cell…
