10
You helped but we CAN'T STOP THIS LASER!
(www.youtube.com)
I love this channel so much. it's like watching a DARPA black project post regular updates to YouTube.
The reflection in the goggles at 36:00 is one of the coolest things I've seen this week, another one is this video.
The first 16min is an excellent overview of the considerations needed to achieve maximum power delivery at the target point.
Not too short, not too long. Videos to last through your meal.
Rules: