Related Clues:
- Chemistry subject
- U-235, e.g.
- Carbon-14, for one
- Uranium-238, e.g.
- Atomic relative
- Carbon-13, e.g.
- Dating material?
- Helium-3, e.g.
- Springfield minor leaguer
- Elemental variant
- Carbon-13 or cobalt-60
- Carbon 14 or uranium 235
- U-238, for one
- Animated Springfield minor leaguer
- Member of a fictional Springfield baseball team