British scientists under the supervision of Ian Wilmut at the Roslin Institute near Edinburgh were able to produce the first clone of an adult mammal. Before Dolly, scientists had only managed to produce a clone from a fully differentiated adult cell from lower species such as frogs. Dolly remained alive and well with functional organs for several years, but was euthanized on February 14th, 2003, after showing symptoms of progressive lung disease.

Other notable events on February 22nd:

In 2014, Ukrainian President Viktor Yanukovych is impeached following widespread protests and flees the country.
In 2011, 185 people are killed in an 6.3 magnitude earthquake in Christchurch, New Zealand.
In 1986, The People Power Revolution begins in the Philippines, resulting in the fall of President Ferdinand Marcos and the restoration of democracy.
In 1948, Czechoslovakia becomes a communist state following a coup d’etat.