Helium Made to Mimic Hydrogen and High-Pitched Voices

How to Disguise a Helium Atom as a Hydrogen Atom > Cause and Effect > How Much Would a Heavier Helium Atom Affect the Pitch of Your Voice?
Physicists made a helium atom act like a hydrogen atom, and the geeks at Slashdot figure out how much the new helium atom would affect the pitch of your voice in comparison to a normal helium atom.