Giving’em the old Philip K Dick joint. Cyberpunk. Adaptation fidelity.
Luminescent tattoos! Bioluminescence, electroluminescence, phosphorescence, and maybe some other -escences too! A world with three boobs. Well, maybe more than that in the whole world. Hand phones. Ubiquitous smart glass. Neck-mounted face-replacing direct-eye laser projectors. Memory manipulation and deletion.
Digging a hole through the Earth. Trying to find hard things to do when building a space elevator is too easy. Adding unnecessary rockets to your earth-faller to reach a seventeen minute trip time. Digging deep in the Earth and heat issues. Finding impenetrable hot rock stew even without piercing the crust. Atmospheric pressure in the center of the Earth. Making it work by vacuum tube. The one easy straight line through the Earth that avoids the Coriolis effect, and the actually useful curved lines between land areas.
Camera rocket grenades that explode into camera bullets. Like a camera, but more messy. IR scanning. Two-dimensional room-mapping by Roomba. Photogrammetry. Playing VR hentai sex games in your room, in your room.