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How can you know what things are getting invented today if it takes 100 years of refinements for it to blossom into common knowledge and use?A good portion of the things mentioned in the book (photography, radio (vacuum tube), telephone, television, cars, refrigerators (and AC generally), vaccines, washing machines, trains, trams, subways, automobiles, airplanes (piston and jet/turbine), rocketry and satellites, etc) were invented and available in the fifty years between 1870 and 1920, and completed mainstreaming/saturation in the fifty years between 1920 and 1970.
There were some things that were invented in the 1920-70 time period: penicillin, CT scan, MRI scans, notable car refinements (fuel injection, crumple zones, seat belts, ABS, airbags), computers, transistors, modems, microwaves, fax/photocopiers.
Besides the Internet and maybe smartphones, what new classes of device were created post-1970s that had a major technological, sociological, or medical effect on society? @cperciva mentioned Li-ion batteries in a comment as well.