Some thoughts: VR, fusion, non-refrigerant cooling technologies, personal genomics, silicon-on-sapphire ICs, every drug and treatment that is just around the corner, quantum computing, CO₂ capture, failed Google projects such as Google Glass, Google Wave, Google contact lens glucose sensor.

Social media that aligns with human needs, permaculture farming, digital voting systems, smart contracts.

Nuclear energy (new OR existing technologies)

optical computing, custom printed medication(s) pills