Packaging roller bearings - GIF

[Frank S]

You may not realize this but there are not a lot of people in this world who can command their hands to do two completely unrelated types of motions like this young person is doing. Don't believe me try writing ABC with a finger in dust on a flat surface and write 123 with a finger of the other hand at the same time or something simpler like draw circles with one and the # symbol with the other If you can do it then do it several times in a row then suddenly switch your drawings to the opposite fingers. YOU can't can you.
watch the concentration on her face as she stabs and counts the bearings while rolling them into the plastic sheathing. This girl/ lady has near perfect individual simultaneous unrelated motor control of her hands