It can be used to build warships, and it can also make plants "come back to life"... 
It can be used to build warships, and it can also make plants "come back to life"... It can be used to build warships, and it can also make plants "come back to life"... It can be used to build warships, and it can also make plants "come back to life"... It can be used to build warships, and it can also make plants "come back to life"... It can be used to build warships, and it can also make plants "come back to life"... It can be used to build warships, and it can also make plants "come back to life"... It can be used to build warships, and it can also make plants "come back to life"... See more interesting videos
The line segment between two points is the shortest, but the speed to reach the end point is not necessarily the fastest:
Longest bead fountain experiment:
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