The first official document to have an emoticon (a 'smiley') at a significant place.
The login to computers lasting a fraction of a second.
Us knowing about our bodies' bacteria far better than now as a standardisation.
Maglev trains or similar fast trains to be available in more countries, and across countries.
Menstruation not being something hush-hush and shameful in any culture but something to be proud of, so that women and girls can get more respect for their bodies and not have to stay home from school or jobs because they can't afford sanitary pads (and of course that toilets with water and soap are built for them to change the sanitary pads regularly and in privacy).