Many hormones and their structural and functional analogs are used as medication . The most commonly prescribed hormones are estrogens and progestogens (as methods of hormonal contraception and as HRT ),  thyroxine (as levothyroxine , for hypothyroidism ) and steroids (for autoimmune diseases and several respiratory disorders ). Insulin is used by many diabetics . Local preparations for use in otolaryngology often contain pharmacologic equivalents of adrenaline , while steroid and vitamin D creams are used extensively in dermatological practice.
A circular paraboloid is theoretically unlimited in size. Any practical reflector uses just a segment of it. Often, the segment includes the vertex of the paraboloid, where its curvature is greatest, and where the axis of symmetry intersects the paraboloid. However, if the reflector is used to focus incoming energy onto a receiver, the shadow of the receiver falls onto the vertex of the paraboloid, which is part of the reflector, so part of the reflector is wasted. This can be avoided by making the reflector from a segment of the paraboloid which is offset from the vertex and the axis of symmetry. For example, in the above diagram the reflector could be just the part of the paraboloid between the points P 1 and P 3 . The receiver is still placed at the focus of the paraboloid, but it does not cast a shadow onto the reflector. The whole reflector receives energy, which is then focused onto the receiver. This is frequently done, for example, in satellite-TV receiving dishes, and also in some types of astronomical telescope ( . , the Green Bank Telescope ).
Each Other : Jasdero and Devit are twin brothers who are incredibly close to each others. They have absolutely no problem with encroach on the living space of each other, going as far as sitting on each other, and being perpetually clinging to each other. They share an inimitable bond, as their memory would imply, is so strong that they are able to guess what the other twin is thinking, enabling them to use their power. It is so infallible that it would be compared to telepathy, which makes sense considering they were originally the same person. Devit, who generally acts cocky and rude, is very kind to Jasdero, and immediately offers to pay back the strands that were ripped during the fight with the exorcists. He is also a bit directive, being the one who mostly take decisions for both. Jasdero seems to highly trust his brother. It comes as no surprise that they immeasurably care for each others, starting to panic whenever one of them seems to be in danger.