European Explorers

http://americanhistory.pppst.com/explorers.html

http://www.biography.com/people

https://www.worldbookonline.com/wb/products?ed=all&gr=Welcome+Brownsburg+Cmty+School+Dist

Latitude and Longitude Games

Here are some games to practice finding coordinates on a map:

http://www.kidsgeo.com/geography-games/latitude-longitude-map-game.php
http://cuip.uchicago.edu/www4teach/97/jlyman/default/quiz/geogtest1.html
http://www.quia.com/rr/2967.html

Crayfish and Butterfly Research

Crayfish

http://www.biokids.umich.edu/critters/Orconectes_rusticus/

http://crayfishblue.weebly.com/fun-facts.html

https://answersingenesis.org/kids/animals/crayfish/

Butterflies

https://defenders.org/butterflies/basic-facts

https://www.kidsbutterfly.org/faq-page

http://www3.canisius.edu/~grandem/butterflylifecycle/The_Lifecycle_of_a_Butterfly_print.html

Invention Research

https://www.thoughtco.com/a-to-z-inventors-4140564
https://www.thoughtco.com/a-to-z-inventors-4140564