The woman whose cells never die - 6 Minute English

Vocabulary in vitro fertilization technique for women who cannot become pregnant naturally in which an egg is fertilized outside her body and the resulting embryo replaced in her womb figure out understand or solve something; work out workhorse someone who does a large amount work, especially dull or routine work scourge something that causes much trouble or suffering unwitting done without knowing or planning centenary the 100th anniversary of an important event