Robots I’d like to see

The world already has the Roomba and the Scooba; I want a Weedba. A small bot (maybe 18” tall) bearing a strong resemblance to a “daddy longlegs” spider that picks its way through your garden, identifies weeds that are sprouting, and carefully uproots them. This is probably more advanced than a robot fruit picker; the mechanical action alone would be tricky, and the image recognition to distinguish weed from garden plant would be very challenging. (Though if the garden starts out weeded and all it has to do is yank out any dicotyledon that pokes out of the ground, that would be easier.)

I’d love to be able to cool my house by putting a set of radiator pipes eight feet under my lawn (through which I can circulate water to have access to 60° temperatures all year round), but digging that much yard up would be extremely expensive. A mole-bot that can dig a small tunnel under my yard and plate the walls with plastic would be ideal: it would have trailing cables providing power and plastic from the surface, and a disposal hose for sending back the tailings from digging. (Rocks could be dealt with using an ultrashort pulse laser.) This would be something run by a professional service that you hire to install and maintain the pipes; they’d likely get huge amounts of business when pipes crack after earthquakes.