What does Hannah believe was the best invention of her time as noted in the novel, An Unnecessary Woman?

Aaliya believes the best invention of her time is the electric alarm clock. She loves this invention because it does not tick like a traditional clock. Aaliya believed that the sound of a traditional clock sounded like the sound of her life ticking away. Since the electric and battery operated clocks don’t make the ticking noise, she doesn’t feel oppressed by them.