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2, 20-25, 20-30, 20's, 20s, 25-30, 40-45, 40-50, 40's, 40s, 45-50, 50-55, 50-60, 55-60, adult, associate, collaborating, colleague, color, colour, communicating, computer, connecting, connexion, defending, discussion, e-book, e-reader, electronic book, electronic reader, fellow, female, fifties, fifty, forties, forty, gal, gentleman, glove, guy, human, human being, indoor, inside, joining, lady, low angle, male, mid life, middle age, middle aged, middle-age, middle-aged, operating, person, r&d, reflecting, reflexion, research and development, rubber glove, safeguard, security, speaking, tablet, tablet computer, talking, team, three-quarter length, together, toiling, twenties, twenty, two, wireless, women, work, world wide web,