View full size image. New measurements of Neptune's atmosphere by a European space telescope suggest that a comet may have crashed into the gas giant about 200 years ago.
Beer brewed after a 13th-century recipe using gruit herbs. Gruit (alternately grut or gruyt) is an old-fashioned herb mixture used for bittering and flavoring beer, popular before the extensive use of hops. Gruit or grut ale may also refer to the beverage produced using gruit. Gruit was a combination of herbs, commonly including sweet gale (Myrica gale), mugwort (Artemisia vulgaris), yarrow (Achillea millefolium), ground ivy (Glechoma hederacea), horehound (Marrubium vulgare), and heather (Calluna vulgaris).
There are many different types of beer, each with a slightly different density. Some of these types are ale, lager, and wheat. Each is made differently but all contain the same basic ingredients. These are: hops, malt, yeast, and water. Specific gravity is the density of a substance divided by the density of water. Therefore, the density is mostly a measure of the amount of water contained within a beer. A beer with a higher percentage of water will have a correspondingly lower density.