1952: The first successful cloning attempt: Using a frog embryo and egg, scientists are able to create a new tadpole.
1996: Dolly the sheep is the first mammal cloned from adult cells. This method had been thought impossible before.
2005: An Afghan hound clone, Snuppy, is born. It’s a breakthrough, as dogs had proved tricky to clone.
2013: Cloned human stem cells are made. Experts hope one day to use cloned stem cells to create human organs for transplanting.