The key to memory retention is active recall (testing yourself) and spaced repetition (periodically revisiting to combat the memory loss curve)
Our apprehension toward this powerful clean-energy source stems from a one-off disaster in Chernobyl (also dramatized as a miniseries). In reality, nuclear power is one of the safest energy sources in the world, registering accident- and pollution-related death rates roughly 300 times lower than those of coal and oil. And it produces no CO2.
There are more slaves today globally (~30m) than there were at the time when slavery was abolished (1865).