Achilles Heel

Achilles was the son of Thetis and Peleus. After it was prophesied that Achilles would die in battle, his mother, Thetis panicked. When Achilles was born she attempted to make him immortal by dipping him in the River Styx. As she immersed him, she held him by one heel. Forgetting to dunk him a second time, the place where she held him remained untouched by the magic water of the Styx, therefore, keeping it vulnerable. Achilles grew up to be a great war hero. However, the vulnerability of his heel still haunted him. One day in battle, a poisoned arrow flew towards him. Bam! It hit his heel. Normally it wouldn’t affect him, however, his heel was still mortal. Therefore the arrow buried into his skin, spreading the poison, thus killing Achilles. To this day, any weak point is called an "Achilles' heel". For example, “My Achilles’ heel is procrastination.” I also thought it was interesting that we refer to the strong tendon that connects the muscles of the calf of the leg with the heel bone as the "Achilles' tendon".