Researchers at Northwestern University have made a major breakthrough that could help mitigate disappointing – and expensive – in vitro fertilization failures.

In vitro fertilization has become the path to parenthood for many, but success can be elusive as it’s difficult to know if the fertilized eggs being used will thrive. 
Researchers at Northwestern University have made a major breakthrough that could help mitigate disappointing – and expensive - failures.
The team discovered that a spark, described as a "zinc firework," occurs at the moment a sperm enzyme renders a human egg active.