Atomic bomb: not to become a reality until the mid-1940s, its possibility was discussed during the first World War.

Crossword puzzle: a creation of the New York World newspaper on December 21st, 1913; first called word-cross, this was transposed to cross-word by January 1914.

Stainless steel: this non-rusting, chromium-steel alloy was produced in 1917.

Vitamin C: in 1912, Funk identified these natural substances and called them Vitamines because he, wrongly, thought they contained amino acids.

Walking wounded: used to describe first World War casualties who could make their way to treatment stations without a stretcher.