These gas-filled tubes contain Tritium, the inner surfaces of these thin glass vials are coated with a phosphor, by undergoing beta decay the gaseous tritium in these light sources is releasing electrons that cause the phosphor layer to fluoresce.
Tritium pose no external radiation threat via
"Slow" marine animals show their secret life under high magnification. Corals and sponges are very mobile creatures, but their motion is only detectable at different time scales compared to ours and requires
This camera take pictures in the dark, single particles of light are recorded