Americium

Actress Angelina Jolie left some audience members baffled when she greeted Derby actor Jack O'Connell with "ay up me duck" at an awards ceremony in 2014.

"Ay up" is a greeting typically used in the North of England and the Midlands instead of hello.

"Me" means "my", while "duck" is an affectionate term for another person.

It originates from the Saxon word ducas and has nothing to do with the bird of the same name.

Prince Harry delighted people in Nottingham when he said "ay up me duck" on a visit to the Confetti Institute of Creative Technologies.

The phrase has encouraged many local businesses to take the name including the Dancing Duck Brewery and Dukki gift shop.

Americium is a radioactive metallic element.

It's the only synthetic element encountered in everyday life, in minute quantities in ionization-type smoke detectors. 

Americium was first synthesized and identified in 1944 by Glenn T. Seaborg, Ralph James, L Morgan, and Albert Ghiorso at the University of California, Berkeley.