Gum Resin, a natural mixture of gum and resin that is obtained from the leaves and bark of certain plants. Gum resin does not dissolve in water and usually has a strong smell and taste. The resins and oils in a gum resin are more useful than the gum. The oils impart a distinctive odor, and often a color, to other materials. Important gum resins are gum ammoniac, asafetida, frankincense, gamboge, and myrrh. These substances have a variety of uses in medicine and pharmacy and in the manufacture of perfume.
Scientists announced the discovery of the largest known planet in the universe. TrES-4 has a density similar to balsa wood, and some say this gas giant could float on water. Learn why this planet is so puzzling and how planet hunters make amazing discoveries like these.
The big bang theory is well-known, but there are many misconceptions about it. Like what? Let's start with this one: There was no bang.