When HN users recommended it
1 HN user recommended this in 2013, in one comment.
20072026
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
1 HN user recommended this in 2013, in one comment.
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
I've seen a few that looked a lot like this actually. For example:
http://www.amazon.com/ROBOTIC-3-Channel-Flying-Ball-Helicopt...
The main difference in the research here just seems to be the separation between the outer ball and the stabilized machinery inside it.