Do I need to pay to enter the museum? what price?

Yes

$6 for 5-17 and $12 for adults. Sometimes there are Groupons available for less. It's a cool little museum.

Yes, it is worth the cost in my opinion. It's not very big but they make good use on the space. There are very knowledgeable people answering questions about all the exhibits.

Yes there is a charge for the museum. If you go on Groupon you will get the best price possible! It isn't very expensive think I paid less than 15 dollars for two people