The crash of flight 143:

how did their calculation error affect the amount of fuel that was pumped into the plane?

What happens when an acid dissolves?

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?

Rays from the sun are not considered matter true or false