Questions with the keyword 'helium'

• What is you favorite type of laser Argon-Ion or Helium-Neon? by xenon to Mike, Pip, Tianfu, Tim, Tom Comments: (So far, one comment )
• Why does helium make your voice go squeaky ? by parfrey72 and 1 other. to Mike, Pip, Tianfu, Tim, Tom Comments: (So far, one comment )