Wuv

 are heart-shaped items that colonists give you in return for fulfilling their needs. A happy colonist will produce new Wuv over time and throw it out on the ground around it. Wuv comes in different sizes, depending on the level of the colonist. The available levels are:
 * Colonist Wuv (worth 1 Wuv)
 * Colonist Wuv x 10 (worth 10 Wuv)
 * Colonist Wuv x 100 (worth 100 Wuv)
 * Colonist Wuv x 1,000 (worth 1k Wuv)
 * Colonist Wuv x 10,000 (worth 10k Wuv)
 * Colonist Wuv x 100,000 (worth 100k Wuv)
 * Colonist Wuv x 1,000,000 (worth 1M Wuv)

Wuv is used for research. When you have selected a research topic at the Research Station and added a starting material, you can then start adding Wuv. Each level of research requires more and more Wuv, so the higher level Wuvs will be more efficient, but you can still use any level Wuv for research.