Light cone components

There are several different rhodopsins in the cones. All of them contain retinal molecules as light-sensitive components, the absorption properties of which are modulated by the different proportions of opsin they... 

If the squared world vector X2 = x2 + y2 + z2 — (ct)2 < 0 it lies within the light cone and X is called time-like. Otherwise XM is space-like. A spacelike four-vector can always be transformed such that the fourth component vanishes. A time-like vector must always have the fourth component, but it can be transformed such that the first three vanish. The difference between two world points... 

Solid fuel is used in many commerical areas from rocket boosters to rock concert light shows. Components of solid fuel fall into four main catagories fuel, oxidizer, other special additives, and a binder. For example, various metal compounds and metal powders are used in fireworks to produce the brilliant colors that you see. An analysis shows that the powder from a gold cone fountain firework contained the following ... 

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