Robotics will get scary very soon. quoted from link:
The conference was open to civilians, but explicitly closed to the press. One attendee described it as an eye-opener. The officials played videos of low-cost drones firing semi-automatic weapons, revealed that Syrian rebels are importing consumer-grade drones to launch attacks, and flashed photos from an exercise that pitted $5,000 worth of drones against a convoy of armored vehicles. (The drones won.) But the most striking visual aid was on an exhibit table outside the auditorium, where a buffet of low-cost drones had been converted into simulated flying bombs. One quadcopter, strapped to 3 pounds of inert explosive, was a DJI Phantom 2, a newer version of the very drone that would land at the White House the next week.
Use delayed responses to wean needy people when you think they are abusing your time and helpfulness. For instance, the new guy comes by asking for help getting started but keeps coming by for things he should do himself. You don’t want to be rude but want to stop it. Progression like immediate response->5m->1h->1day has worked for me with email.
Delayed response is also great to cool off heated discussions.