Radioisotope heater units (RHU) are small devices that provide heat through radioactive decay. They are similar to tiny radioisotope thermoelectric generators (RTG) and normally provide about one watt of heat each, derived from the decay of a few grams of plutonium-238—although other radioactive isotopes could be used. The heat produced by these RHUs is given off continuously for several decades and, theoretically, for up to a century or more.

Stanford University Mathematics Camp, or SUMaC, is a competitive summer mathematics program for rising high school juniors and seniors around the world. The camp lasts for 4 weeks, usually from mid-July to mid-August. It is based on the campus of Stanford University.

Sumac (Assyrian:ܣܘܼܡܵܩܵܐ "Sumaq" red-red shift-turning red, , or ; also spelled sumach) is any one of about 35 species of flowering plants in the genus Rhus and related genera, in the family Anacardiaceae. Sumacs grow in subtropical and temperate regions throughout the world, especially in Africa and North America.