They fly longer than drones... and they're much more adorable. Farmers can use drones to monitor their fields, but they have their limits when they can rarely fly for more than 20 to 30 minutes at a time.
Imagine that you need to break a $10 bill. You hand the cashier the $10 note and, rather than a $5 bill and five $1 bills, he hands back a single $1 bill. Certainly, you would be upset. And if you couldn’t