Silkworm cocoons glow several colours when exposed to blue LEDs at the "Hikari the Wonder of Light" exhibition...
Silkworm cocoons glow several colours when exposed to blue LEDs at the "Hikari the Wonder of Light" exhibition at the National Museum of Nature and Science in Tokyo October 29, 2014. REUTERS/Toru Hanai (JAPAN - Tags: ENVIRONMENT SCIENCE TECHNOLOGY)