1. video calls, and free worldwide calls in general, mobile to mobile.
2. all (or most of) the knowledge at your fingertips, within seconds.
3. all modern conveniences - we can live better than the kings of the past.
4. making ideas a reality easily (3d modelling, 3d printing, computational/fluid dynamics, structural design etc.)
5. building, reaching your audience and sharing ideas worldwide, easily and simply
p.s. even the best bike ligths together with the whole bike industry are still at 4-6 out of 10, a long way to go towards engineering excellence, imo.