# Losing Your Marbles, 13,000 at a Time

Building marble runs is a blast. Now imagine building a marble run that moves thousands of marbles at a time! A guy named Jelle Nikkers put together giant slides, zigzag ramps and tipping seesaws to make a giant machine that moves 11,000 marbles at a time. Check out the video to see the marbles do all kinds of tricks, and to hear the rushing river-like sound they make!

Wee ones: Which has fewer marbles, a seesaw holding 5 marbles or a seesaw holding 7 marbles?

Little kids: The first seesaw shown tips when it fills with 10 marbles. If 6 have rolled onto it so far, how many more are needed to tip it?  Bonus: The machine holds 13,000 marbles total, with 11,000 on the move at once. How many marbles are sitting around waiting their turn?

Big kids: The whole marble run is 33 feet long and 4 feet wide! If you and your friends are all 5 feet tall, how many of you have to lie head to toe to stretch longer than the marble run?  Bonus: If it fits inside a perfect rectangle, how far is it to walk all the way around it?

Wee ones: The one holding 5 marbles.

Little kids: 4 more marbles.  Bonus: 2,000 marbles.

Big kids: 7 of you, since 6 of you will stretch only 30 feet.  Bonus: 74 feet, since you have to walk the 33 twice and the 4 twice.

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