Mementos are the resource used to evolve stronger Axie parts. New Mementos are generated when an axie is released. Every battle, every level, and every breed contributes to a progression loop where stronger axies help create the next generation.

Movie executives feared the public would find Christopher Nolan’s 2000 film “Memento” too confusing. It took a year to find someone to distribute the film, but the film became his breakthrough.

One of the honors of serving as President is having the "Presidential Challenge Coin" — a memento that I have handed out as President and in the years since to the folks I meet who have served our country or their communities. I was grateful to be able to greet veterans who served in Korea and Vietnam as they arrived in DC this weekend, and give them a personal token of my gratitude.

Long before he became a national World Cup hero, Orlando Gill gave a precious memento to a friend in return for cash. Now the friend is ready to give it back.