6.8
2007
 The Insects Unlisted in the Encyclopedia (2007)
The Insects Unlisted in the Encyclopedia (2007)
6.4
2005
 Turtles Are Surprisingly Fast Swimmers (2005)
Turtles Are Surprisingly Fast Swimmers (2005)
6.7
2006
 Time Limit Investigator (2006)
Time Limit Investigator (2006)