Photon Questions

• Are there any massless particles?
• As light from a star spreads out and weakens, do gaps form between the photons?
• Can humans ever directly see a photon?
• Can one bit of light bounce off another bit of light?
• How bright is a laser beam when viewed from the side?
• How do 5G cell phone signals harm humans?
• How do you make a one-photon-thick beam of light?
• How does a photon accelerate to light speed so quickly?
• How long can you use a cell phone before getting a brain tumor?
• Is light a particle or a wave?
• When does a light beam have only a single frequency?
• Why is light pure energy?
• Why is time frozen from light's perspective?